Make TapCancel ignore ack disposition

There is no reason to block on ack receipt for a TapCancel, particularly as
this event will always reach the main thread and will often precede gestures
that can be handled on the impl thread.  Add TapCancel to the event types
for which event acks will be ignored.

BUG=302852, 313353

Review URL: https://codereview.chromium.org/50433003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@232519 0039d316-1c4b-4281-b951-d872f2087c98
Disable SyntheticGestureControllerNewTest.TwoGesturesInFlight due to flakiness.

BUG=314272
TBR=dominikg

Review URL: https://codereview.chromium.org/50553006

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@232520 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 232519
Check for WRITE_DAC in the Access Mask as this can be used to change the DACL which is something we don't want to allow.

Fix corresponding issue found with this additional check where the permissions on the shared memory object used in the GPU host were too broad.

BUG=307301

Review URL: https://codereview.chromium.org/51053003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@232521 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 232520
[android_webview] Fix findbugs warnings.

Refactor the code a bit and don't ignore return value of delete().

BUG=230209
TEST=AndroidWebViewTest

Review URL: https://codereview.chromium.org/52723009

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@232522 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 232521
SVN changes up to revision 232522