Enable disabling WebCore::GraphicsContext in telemetry.

cc/trees/layer_tree_host_pixeltest_on_demand_raster.cc

Index: cc/trees/layer_tree_host_pixeltest_on_demand_raster.cc
diff --git a/cc/trees/layer_tree_host_pixeltest_on_demand_raster.cc b/cc/trees/layer_tree_host_pixeltest_on_demand_raster.cc
index 8f6242d3e79e6fc5fcbcfde251092b522587fa1e..832eac75d1a7d6de6a2e089f216195f59294d5f9 100644
--- a/cc/trees/layer_tree_host_pixeltest_on_demand_raster.cc
+++ b/cc/trees/layer_tree_host_pixeltest_on_demand_raster.cc
@@ -65,9 +65,11 @@ class BlueYellowLayerClient : public ContentLayerClient {
 
   virtual bool FillsBoundsCompletely() const OVERRIDE { return false; }
 
-  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 gc_status) OVERRIDE {
     *opaque = gfx::RectF(layer_rect_.width(), layer_rect_.height());
 
     SkPaint paint;