[WK2] WebPageProxy loadURL() won't work when called just after terminateProcess()
https://bugs.webkit.org/show_bug.cgi?id=110743

Patch by Adenilson Cavalcanti <cavalcantii@gmail.com> on 2013-04-12
Reviewed by Benjamin Poulain.

Source/WebKit2: 

A call to loadURL() just after terminating WebProcess will fail thanks to
WebPageProxy being in an undefined state since it is in the middle of its own
cleanup after process termination.

To properly fix this, not only WebPageProxy cleanup should be made
at WebProcess termination request, but also WebProcessProxy needs
to only return to its caller after terminating the process and
closing connections. Otherwise, WebPageProxy can even be able to
detect that WebProcess is no longer running, but a call to respawn
the process will fail.

To fix these issues, this patch moves the cleanup code to a shared private function
that is used for both the cases i.e. user termination and real crash. WebProcess
shutdown is done using a new method that ensures that all cleanup was done before
returning.

A last change introduced in this patch is that for user requested termination,
clients are no longer notified of a crash (since it is not a crash).

* UIProcess/WebPageProxy.cpp:
(WebKit::WebPageProxy::terminateProcess):
(WebKit::WebPageProxy::processDidCrash):
(WebKit):
(WebKit::WebPageProxy::resetStateAfterProcessExited):
* UIProcess/WebPageProxy.h:
(WebPageProxy):
* UIProcess/WebProcessProxy.cpp:
(WebKit::WebProcessProxy::userRequestedTerminate):
(WebKit):
* UIProcess/WebProcessProxy.h:
(WebProcessProxy):

Tools: 

Adding a new test file to check if loading a page just after WebProcess
has crashed (or was terminated) works. The test executes the
following steps (Load, Crash, Load), thus stressing WebProcess
reattach and process termination code path.

* TestWebKitAPI/GNUmakefile.am:
* TestWebKitAPI/PlatformEfl.cmake:
* TestWebKitAPI/TestWebKitAPI.xcodeproj/project.pbxproj:
* TestWebKitAPI/Tests/WebKit2/MouseMoveAfterCrash.cpp:
(TestWebKitAPI::setPageLoaderClient):
(TestWebKitAPI::TEST):
* TestWebKitAPI/Tests/WebKit2/LoadPageOnCrash.cpp: Added.
(TestWebKitAPI):
(WebKit2CrashLoader):
(TestWebKitAPI::WebKit2CrashLoader::WebKit2CrashLoader):
(TestWebKitAPI::WebKit2CrashLoader::loadUrl):
(TestWebKitAPI::WebKit2CrashLoader::crashWebProcess):
(TestWebKitAPI::didFinishLoad):
(TestWebKitAPI::TEST):
* TestWebKitAPI/Tests/WebKit2/WebKit2.pro:


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@148312 268f45cc-cd09-0410-ab3c-d52691b4dbfc