[chromium] Allow us to disable overdraw metrics when tracing is off

[chromium] Allow us to disable overdraw metrics when tracing is off
https://bugs.webkit.org/show_bug.cgi?id=81431

Patch by Dana Jansens <danakj@chromium.org> on 2012-03-20
Reviewed by Adrienne Walker.

Source/WebCore:

This change allows us to disable overdraw metrics conditionally in the
future with a one-line change in each LayerTreeHost class.

Unit test: CCQuadCullerTest.verifyWithoutMetrics

* platform/graphics/chromium/cc/CCLayerTreeHost.cpp:
(WebCore::CCLayerTreeHost::paintLayerContents):
* platform/graphics/chromium/cc/CCLayerTreeHostImpl.cpp:
(WebCore::CCLayerTreeHostImpl::calculateRenderPasses):
* platform/graphics/chromium/cc/CCOcclusionTracker.cpp:
(WebCore::::CCOcclusionTrackerBase):
(WebCore):
* platform/graphics/chromium/cc/CCOcclusionTracker.h:
(CCOcclusionTrackerBase):
* platform/graphics/chromium/cc/CCOverdrawMetrics.cpp:
(WebCore::CCOverdrawMetrics::CCOverdrawMetrics):
(WebCore::CCOverdrawMetrics::didCull):
(WebCore::CCOverdrawMetrics::didDraw):
(WebCore::CCOverdrawMetrics::recordMetrics):
* platform/graphics/chromium/cc/CCOverdrawMetrics.h:
(WebCore::CCOverdrawMetrics::create):
(CCOverdrawMetrics):

Source/WebKit/chromium:

* tests/CCOcclusionTrackerTest.cpp:
(WebCore::TestCCOcclusionTrackerBase::TestCCOcclusionTrackerBase):
* tests/CCQuadCullerTest.cpp:
(WebCore::TestCCOcclusionTrackerImpl::TestCCOcclusionTrackerImpl):
(WebCore::TEST):
(WebCore):
* tests/TiledLayerChromiumTest.cpp:
(WTF::TestCCOcclusionTracker::TestCCOcclusionTracker):

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@111441 268f45cc-cd09-0410-ab3c-d52691b4dbfc