Avoid AsyncTask ThreadPool leak in RecentTaskLoaser

In MTBF test, if “Press KEYCODE_HOME” is simulated quickly and frequently,
ThreadPool overflow would be triggered, which would crash systemui.

When pressing hardware KEYCODE_HOME on the phone repeatedly, upon key down,
systemui will preload recent task list; upon key up, it will cancel the
request for preloading. During preloading, two AsyncTasks (mTaskLoader
and mThumbnailLoader) will be started. Both of them will use
executeOnExecutor(AsyncTask.THREAD_POOL_EXECUTOR) to run.

Cancel predloading means we don't need mTaskLoader and mThumbnailLoader
any more, so we'd better use cancel(true) to interrupt these two AsyncTasks
and catch this InterruptedException to return directly.

If we use cancel(false) it won't interrupt these two AsyncTasks and
mThumbnailLoader may be blocked in blocking queue "tasksWaitingForThumbnails"
whcih will cause ThreadPool overflow.
There is situation that mThumbnailLoader’s thread runs before mTaskLoader’s.
Just at this moment, cancelPreloadingRecentTasksList tries to cancel
both mTaskLoader and mThumbnailLoader. Then mTaskLoader was cancelled
directly as it didn't start, mThumbnailLoader could not stop and blocks
on "tasksWaitingForThumbnails" forever. At last, many AsyncTasks for
mThumbnailLoader are not cancelled but left in waited state.

Change-Id: I62bef320a62f28a442117f7d2c8160ea49e1a1fe
Signed-off-by: jshe32X<jianchunx.shen@intel.com>
Signed-off-by: Guobin Zhang<guobin.zhang@intel.com>
Remove T-mobile items not used by new theme engine

Change-Id: I1e9c14e63ec25fdff61cfd2b7b8a05b1e488e558
New command line tool 'idmap'

Introduce a new tool 'idmap' to handle generation and verification of
idmap files. The tool is modelled on 'dexopt', and is intended to be
used similarly, notably by 'installd'.
See cmds/idmap/idmap.cpp for further documentation on 'idmap'.

Note: this commit is interdependent on a commit in project build/ to add
'idmap' to PRODUCT_PACKAGES.

Note: the changes to androidfw are only stubs. The actual implementation
will be provided in Runtime resource overlay, iteration 2.

Change-Id: I7131b74ece1e46c8a9c0a31d103e686aa07da2bb
Runtime resource overlay, iteration 2

Support any number of overlay packages. Support any target package.

UPDATED PACKAGE MATCHING
------------------------
In Runtime resource overlay, iteration 1, only a single overlay package
was considered. Package matching was based on file paths:
/vendor/overlay/system/framework-res.apk corresponded to
/system/framework-res.apk. Introduce a more flexible matching scheme
where any package is an overlay package if its manifest includes

    <overlay targetPackage="com.target.package"/>

For security reasons, an overlay package must fulfill certain criteria
to take effect: see below.

THE IDMAP TOOL AND IDMAP FILES
------------------------------
Idmap files are created by the 'idmap' binary; idmap files must be
present when loading packages. For the Android system, Zygote calls
'idmap' as part of the resource pre-loading. For application packages,
'idmap' is invoked via 'installd' during package installation (similar
to 'dexopt').

UPDATED FLOW
------------
The following is an outline of the start-up sequences for the Android
system and Android apps. Steps marked with '+' are introduced by this
commit.

Zygote initialization
   Initial AssetManager object created
+    idmap --scan creates idmaps for overlays targeting 'android', \
           stores list of overlays in /data/resource-cache/overlays.list
   AssetManager caches framework-res.apk
+  AssetManager caches overlay packages listed in overlays.list

Android boot
   New AssetManager's ResTable acquired
     AssetManager re-uses cached framework-res.apk
+    AssetManager re-uses cached 'android' overlays (if any)

App boot
   ActivityThread prepares AssetManager to load app.apk
+  ActivityThread prepares AssetManager to load app overlays (if any)
   New AssetManager's ResTable acquired as per Android boot

SECURITY
--------
Overlay packages are required to be pre-loaded (in /vendor/overlay).
These packages are trusted by definition. A future iteration of runtime
resource overlay may add support for downloaded overlays, which would
likely require target and overlay signatures match for the overlay to
be trusted.

LOOKUP PRIORITY
---------------
During resource lookup, packages are sequentially queried to provide a
best match, given the constraints of the current configuration. If any
package provide a better match than what has been found so far, it
replaces the previous match. The target package is always queried last.

When loading a package with more than one overlay, the order in which
the overlays are added become significant if several packages overlay
the same resource.

Had downloaded overlays been supported, the install time could have been
used to determine the load order. Regardless, for pre-installed
overlays, the install time is randomly determined by the order in which
the Package Manager locates the packages during initial boot. To support
a well-defined order, pre-installed overlay packages are expected to
define an additional 'priority' attribute in their <overlay> tags:

    <overlay targetPackage="com.target.package" priority="1234"/>

Pre-installed overlays are loaded in order of their priority attributes,
sorted in ascending order.

Assigning the same priority to several overlays targeting the same base
package leads to undefined behaviour. It is the responsibility of the
vendor to avoid this.

The following example shows the ResTable and PackageGroups after loading
an application and two overlays. The resource lookup framework will
query the packages in the order C, B, A.

        +------+------+-     -+------+------+
        | 0x01 |      |  ...  |      | 0x7f |
        +------+------+-     -+------+------+
            |                           |
        "android"                Target package A
                                        |
                       Pre-installed overlay B (priority 1)
                                        |
                       Pre-installed overlay C (priority 2)

Change-Id: If49c963149369b1957f7d2303b3dd27f669ed24e
Runtime resource overlay, iteration 2, test cases

Add automated test cases for runtime resource overlay, iteration 2.

The test cases are a mixture of 'adb shell' commands and regular
instrumentation tests. The device is rebooted between tests to setup
different overlay scenarios for framework-res.apk.

To verify Runtime resoure overlay, iteration 2, run
    $ frameworks/base/core/tests/overlaytests/testrunner.py

For a list of supported options, run
    $ frameworks/base/core/tests/overlaytests/testrunner.py --help

Change-Id: I692aa1a7ad073efd116b24f9ec7f197dfd65dfef