https://bugs.webkit.org/show_bug.cgi?id=96137

Patch by Terry Anderson <tdanderson@chromium.org> on 2012-09-19
Reviewed by Stephen White.

Source/WebCore:

When the compositor creates a PlatformContextSkia, the scale on |canvas| will
be equal to the content scale factor (which, without pinch-to-zoom, will be
the same as the device scale factor). Set this value as a member on PlatformContextSkia,
which will be used to correctly render glyphs when hinting is used and the device
scale factor is not 1.

Tests: added two new unit tests.

* platform/graphics/chromium/OpaqueRectTrackingContentLayerDelegate.cpp:
(WebCore::OpaqueRectTrackingContentLayerDelegate::paintContents):
* platform/graphics/skia/PlatformContextSkia.cpp:
(WebCore::PlatformContextSkia::PlatformContextSkia):
(WebCore::PlatformContextSkia::setupPaintCommon):
* platform/graphics/skia/PlatformContextSkia.h:
(PlatformContextSkia):
(WebCore::PlatformContextSkia::setHintingScaleFactor):
(WebCore::PlatformContextSkia::hintingScaleFactor):

Source/WebKit/chromium:

Define SK_SUPPORT_HINTING_SCALE_FACTOR by default. This is also used
for the skia patch here: https://codereview.appspot.com/6506099/.
Also added two new unit tests.

* features.gypi:
* tests/OpaqueRectTrackingContentLayerDelegateTest.cpp:
(WebCore):
(WebCore::HintingScaleCallback::HintingScaleCallback):
(HintingScaleCallback):
(WebCore::HintingScaleCallback::operator()):
(WebCore::TEST_F):
* tests/PlatformContextSkiaTest.cpp:
(WebCore):
(WebCore::TEST):

LayoutTests:

These tests will fail due to a font hinting/rasterization issue with
chromium DRT pixel tests having a page/device scale factor of 2.
See crbug.com/150682.

* platform/chromium/TestExpectations:

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@129054 268f45cc-cd09-0410-ab3c-d52691b4dbfc