Initial skeleton of high-contrast mode.

third_party/WebKit/Source/platform/graphics/GraphicsLayer.h

Index: third_party/WebKit/Source/platform/graphics/GraphicsLayer.h
diff --git a/third_party/WebKit/Source/platform/graphics/GraphicsLayer.h b/third_party/WebKit/Source/platform/graphics/GraphicsLayer.h
index 1988779fc202731c6c2b9e241a63742c4163c1d4..8cc930d7cff74572e74de6e97588313d75c72752 100644
--- a/third_party/WebKit/Source/platform/graphics/GraphicsLayer.h
+++ b/third_party/WebKit/Source/platform/graphics/GraphicsLayer.h
@@ -249,6 +249,7 @@ class PLATFORM_EXPORT GraphicsLayer : public cc::LayerClient,
 
   IntRect InterestRect();
   void Paint(const IntRect* interest_rect,
+             HighContrastSettings* = nullptr,
              GraphicsContext::DisabledMode = GraphicsContext::kNothingDisabled);
 
   // cc::LayerClient implementation.
@@ -290,6 +291,7 @@ class PLATFORM_EXPORT GraphicsLayer : public cc::LayerClient,
   // Returns true if PaintController::paintArtifact() changed and needs commit.
   bool PaintWithoutCommit(
       const IntRect* interest_rect,
+      HighContrastSettings* = nullptr,
       GraphicsContext::DisabledMode = GraphicsContext::kNothingDisabled);
 
   // Adds a child without calling updateChildList(), so that adding children