Enable disabling WebCore::GraphicsContext in telemetry.

cc/layers/picture_image_layer.cc

Index: cc/layers/picture_image_layer.cc
diff --git a/cc/layers/picture_image_layer.cc b/cc/layers/picture_image_layer.cc
index c041936573bcbc1fd9df106a63675fe4a1411b8c..2907cd22e0c666cfb9765e0a983aa882a09192e1 100644
--- a/cc/layers/picture_image_layer.cc
+++ b/cc/layers/picture_image_layer.cc
@@ -40,10 +40,12 @@ void PictureImageLayer::SetBitmap(const SkBitmap& bitmap) {
   SetNeedsDisplay();
 }
 
-void PictureImageLayer::PaintContents(SkCanvas* canvas,
-                                      const gfx::Rect& clip,
-                                      gfx::RectF* opaque) {
-  if (!canvas || !bitmap_.width() || !bitmap_.height())
+void PictureImageLayer::PaintContents(
+    SkCanvas* canvas,
+    const gfx::Rect& clip,
+    gfx::RectF* opaque,
+    ContentLayerClient::GraphicsContextStatus) {
+  if (!bitmap_.width() || !bitmap_.height())

[danakj, 2014/05/01 17:07:11]

Do you want to early out here based on the GraphicsContextStatus instead of the
null canvas? Or is removing the early out intentional?

[Stephen Chennney, 2014/05/01 19:12:26]

Sami added the !canvas check during the previous attempt at solving this
problem. Originally, and again now, there is no way this is called with a null
canvas, and as compositor code we are not concerned with preventing drawing here
for telemetry.

Having said that, would you prefer to keep the canvas check?

[danakj, 2014/05/01 19:15:14]

No, I don't want to early out on canvas if it's never null. I just want to make
sure you want this layer to be drawing its bitmap into the canvas when
GraphicsContextDisabled.

     return;
 
   SkScalar content_to_layer_scale_x =