Mac: Don't repaint scrollbars every frame

cc/test/fake_layer_tree_host.h

Index: cc/test/fake_layer_tree_host.h
diff --git a/cc/test/fake_layer_tree_host.h b/cc/test/fake_layer_tree_host.h
index 5927dec6bb604d8c440d35c1b9524d98c81e8fa3..5e6bb1026ffdeb1bb95b35d7ca64daa907b24d75 100644
--- a/cc/test/fake_layer_tree_host.h
+++ b/cc/test/fake_layer_tree_host.h
@@ -29,6 +29,7 @@ class FakeLayerTreeHost : public LayerTreeHost {
 
   ~FakeLayerTreeHost() override;
 
+  const RendererCapabilities& GetRendererCapabilities() const override;

[enne (OOO), 2015/11/23 19:05:24]

What are these renderer capability changes for?

[ccameron, 2015/11/24 01:12:04]

The issue is the call to get max texture size, from
https://code.google.com/p/chromium/codesearch#chromium/src/cc/layers/painted_...

In principle, I could cut a bit closer (overriding the PaintedScrollbarLayer
method), but I felt this was a better.

[enne (OOO), 2015/11/24 17:59:18]

Ohhhh, max texture size.  Thanks for the explanation.

   void SetNeedsCommit() override;
   void SetNeedsUpdateLayers() override {}
   void SetNeedsFullTreeSync() override {}
@@ -54,6 +55,11 @@ class FakeLayerTreeHost : public LayerTreeHost {
 
   bool needs_commit() { return needs_commit_; }
 
+  void set_renderer_capabilities(const RendererCapabilities& capabilities) {
+    renderer_capabilities_set = true;
+    renderer_capabilities = capabilities;
+  }
+
  protected:
   FakeLayerTreeHost(FakeLayerTreeHostClient* client,
                     LayerTreeHost::InitParams* params);
@@ -64,6 +70,9 @@ class FakeLayerTreeHost : public LayerTreeHost {
   TestSharedBitmapManager manager_;
   FakeLayerTreeHostImpl host_impl_;
   bool needs_commit_;
+
+  bool renderer_capabilities_set;
+  RendererCapabilities renderer_capabilities;
 };
 
 }  // namespace cc