Enable disabling WebCore::GraphicsContext in telemetry.

cc/layers/content_layer_unittest.cc

Index: cc/layers/content_layer_unittest.cc
diff --git a/cc/layers/content_layer_unittest.cc b/cc/layers/content_layer_unittest.cc
index 8770303ad9096bee29f04d7eb77b8a9e4f5afe2a..4b3fb9941eb149dcf74bc3a34bde41fdc66a2f5c 100644
--- a/cc/layers/content_layer_unittest.cc
+++ b/cc/layers/content_layer_unittest.cc
@@ -20,9 +20,11 @@ class MockContentLayerClient : public ContentLayerClient {
   explicit MockContentLayerClient(const gfx::Rect& opaque_layer_rect)
       : opaque_layer_rect_(opaque_layer_rect) {}
 
-  virtual void PaintContents(SkCanvas* canvas,
-                             const gfx::Rect& clip,
-                             gfx::RectF* opaque) OVERRIDE {
+  virtual void PaintContents(
+      SkCanvas* canvas,
+      const gfx::Rect& clip,
+      gfx::RectF* opaque,
+      ContentLayerClient::GraphicsContextStatus) OVERRIDE {
     *opaque = gfx::RectF(opaque_layer_rect_);
   }
   virtual void DidChangeLayerCanUseLCDText() OVERRIDE {}