Enable disabling WebCore::GraphicsContext in telemetry.

cc/test/fake_content_layer_client.cc

Index: cc/test/fake_content_layer_client.cc
diff --git a/cc/test/fake_content_layer_client.cc b/cc/test/fake_content_layer_client.cc
index 39966544101c5174c5bafca265ad8808e7e33f5c..9f75d8920bb69d52c49eb5be432425a9fb2592ac 100644
--- a/cc/test/fake_content_layer_client.cc
+++ b/cc/test/fake_content_layer_client.cc
@@ -15,11 +15,13 @@ FakeContentLayerClient::FakeContentLayerClient()
 FakeContentLayerClient::~FakeContentLayerClient() {
 }
 
-void FakeContentLayerClient::PaintContents(SkCanvas* canvas,
-    const gfx::Rect& paint_rect, gfx::RectF* opaque_rect) {
+void FakeContentLayerClient::PaintContents(
+    SkCanvas* canvas,
+    const gfx::Rect& paint_rect,
+    gfx::RectF* opaque_rect,
+    ContentLayerClient::GraphicsContextStatus gc_status) {
   last_canvas_ = canvas;
-  if (!canvas)
-    return;
+  last_context_status_ = gc_status;
 
   if (paint_all_opaque_)
     *opaque_rect = paint_rect;