https://bugs.webkit.org/show_bug.cgi?id=72402

Reviewed by Dirk Pranke.

Tools:

Allows the compositing layout tests to run in the normal layout test run. This sets the default compositing
triggers in DumpRenderTree to more closely match what we use in Chromium. There are two exceptions, canvas 2d
and video (media) are still controlled by an explicit trigger so that they are true when platform=chromium-gpu
and false otherwise, so that we can run the same set of tests in both configurations. This isn't necessary for
the normal compositing triggers since we currently run the compositing tests in only one configuration - with
compositing enabled.

Since the compositing tests are currently marked WONTFIX SKIP on non-GPU platforms in test_expectations.txt this
patch should not impact any tests.

* DumpRenderTree/chromium/DumpRenderTree.cpp:
(main):
* DumpRenderTree/chromium/TestShell.cpp:
(TestShell::TestShell):
(TestShell::resetWebSettings):
* DumpRenderTree/chromium/TestShell.h:
(TestShell::setAcceleratedCompositingForVideoEnabled):
* DumpRenderTree/chromium/WebPreferences.cpp:
(WebPreferences::reset):
(WebPreferences::applyTo):
* DumpRenderTree/chromium/WebPreferences.h:
* Scripts/webkitpy/layout_tests/port/chromium.py:
* Scripts/webkitpy/layout_tests/port/chromium_gpu.py:
* Scripts/webkitpy/layout_tests/port/chromium_gpu_unittest.py:

LayoutTests:

* platform/chromium/test_expectations.txt:

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@100355 268f45cc-cd09-0410-ab3c-d52691b4dbfc