Enable disabling WebCore::GraphicsContext in telemetry.

cc/trees/layer_tree_host_common_unittest.cc

Index: cc/trees/layer_tree_host_common_unittest.cc
diff --git a/cc/trees/layer_tree_host_common_unittest.cc b/cc/trees/layer_tree_host_common_unittest.cc
index b5e23f3a93da3fa8791e24e84be8bf5caaa48ef6..bd4cc4c8d98785966eebebb7cab5982a88bfce9f 100644
--- a/cc/trees/layer_tree_host_common_unittest.cc
+++ b/cc/trees/layer_tree_host_common_unittest.cc
@@ -229,9 +229,11 @@ class MockContentLayerClient : public ContentLayerClient {
  public:
   MockContentLayerClient() {}
   virtual ~MockContentLayerClient() {}
-  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 {}
   virtual void DidChangeLayerCanUseLCDText() OVERRIDE {}
   virtual bool FillsBoundsCompletely() const OVERRIDE { return false; }
 };