Replace source pointer in cc::CopyOutputRequest with a base::UnguessableToken

content/browser/renderer_host/render_widget_host_view_browsertest.cc

Index: content/browser/renderer_host/render_widget_host_view_browsertest.cc
diff --git a/content/browser/renderer_host/render_widget_host_view_browsertest.cc b/content/browser/renderer_host/render_widget_host_view_browsertest.cc
index b2f1ae95e658638087625111b8507e7f8146426c..5b7cf292b7376ca8d5024f4bd719c7d79c6499cc 100644
--- a/content/browser/renderer_host/render_widget_host_view_browsertest.cc
+++ b/content/browser/renderer_host/render_widget_host_view_browsertest.cc
@@ -250,9 +250,9 @@ class CompositingRenderWidgetHostViewBrowserTest
 class FakeFrameSubscriber : public RenderWidgetHostViewFrameSubscriber {
  public:
   FakeFrameSubscriber(
-    RenderWidgetHostViewFrameSubscriber::DeliverFrameCallback callback)
-      : callback_(callback) {
-  }
+      RenderWidgetHostViewFrameSubscriber::DeliverFrameCallback callback)
+      : callback_(callback),
+        source_id_for_copy_request_(base::UnguessableToken::Create()) {}
 
   bool ShouldCaptureFrame(const gfx::Rect& damage_rect,
                           base::TimeTicks present_time,
@@ -271,8 +271,13 @@ class FakeFrameSubscriber : public RenderWidgetHostViewFrameSubscriber {
     return true;
   }
 
+  base::UnguessableToken GetSourceIdForCopyRequest() override {

[Fady Samuel, 2017/01/26 21:22:42]

const base::UnguessableToken&

[Saman Sami, 2017/01/26 21:47:27]

Done.

+    return source_id_for_copy_request_;
+  }
+
  private:
   DeliverFrameCallback callback_;
+  base::UnguessableToken source_id_for_copy_request_;
 };
 
 // Disable tests for Android as it has an incomplete implementation.