Moving GraphicsContext and dependencies from core to platform.

Source/web/web.gypi

Index: Source/web/web.gypi
diff --git a/Source/web/web.gypi b/Source/web/web.gypi
index 77d5c8a258d9beeea2b0359fa6d4c09454e02aca..8cc0a7e22ab9f16f1b495408035fa4138b4d0e8d 100644
--- a/Source/web/web.gypi
+++ b/Source/web/web.gypi
@@ -254,8 +254,6 @@
       'WorkerPermissionClient.cpp',
       'WorkerPermissionClient.h',
       'default/WebRenderTheme.cpp',
-      'linux/WebFontInfo.cpp',
-      'linux/WebFontRenderStyle.cpp',
       'linux/WebFontRendering.cpp',
       'mac/WebScrollbarTheme.cpp',
       'mac/WebSubstringUtil.mm',
@@ -266,23 +264,35 @@
     ],
     'web_unittest_files': [
       'tests/AssociatedURLLoaderTest.cpp',
+      'tests/BitmapImageTest.cpp',
+      'tests/Canvas2DLayerBridgeTest.cpp',
+      'tests/Canvas2DLayerManagerTest.cpp',
       'tests/ChromeClientImplTest.cpp',
       'tests/CompositedLayerMappingTest.cpp',
       'tests/CustomEventTest.cpp',
+      'tests/DeferredImageDecoderTest.cpp',
       'tests/DragImageTest.cpp',
+      'tests/DrawingBufferTest.cpp',
       'tests/FakeWebPlugin.cpp',
       'tests/FakeWebPlugin.h',
       'tests/FilterOperationsTest.cpp',
       'tests/FrameLoaderClientImplTest.cpp',
       'tests/FrameTestHelpers.cpp',
       'tests/FrameTestHelpers.h',
+      'tests/GIFImageDecoderTest.cpp',
+      'tests/GraphicsContextTest.cpp',
       'tests/GraphicsLayerTest.cpp',
+      'tests/ImageDecodingStoreTest.cpp',
       'tests/ImageFilterBuilderTest.cpp',
+      'tests/ImageFrameGeneratorTest.cpp',
       'tests/ImageLayerChromiumTest.cpp',
+      'tests/JPEGImageDecoderTest.cpp',
       'tests/KeyboardTest.cpp',
       'tests/LinkHighlightTest.cpp',
       'tests/ListenerLeakTest.cpp',
       'tests/MemoryInfo.cpp',
+      'tests/MockImageDecoder.h',
+      'tests/MockWebGraphicsContext3D.h',
       'tests/OpaqueRectTrackingContentLayerDelegateTest.cpp',
       'tests/OpenTypeVerticalDataTest.cpp',
       'tests/PageSerializerTest.cpp',
@@ -301,6 +311,7 @@
       'tests/WebImageTest.cpp',
       'tests/WebInputEventConversionTest.cpp',
       'tests/WebInputEventFactoryTestMac.mm',
+      'tests/WEBPImageDecoderTest.cpp',
       'tests/WebPageNewSerializerTest.cpp',
       'tests/WebPageSerializerTest.cpp',
       'tests/WebPluginContainerTest.cpp',