Tiling priorities in Android Webview.

cc/trees/layer_tree_host_impl.h

Index: cc/trees/layer_tree_host_impl.h
diff --git a/cc/trees/layer_tree_host_impl.h b/cc/trees/layer_tree_host_impl.h
index f5142f925e413404df06c65b195e438a4373a812..ff2e78bb94d5233f08ee7281885a2b63b7b1c2fa 100644
--- a/cc/trees/layer_tree_host_impl.h
+++ b/cc/trees/layer_tree_host_impl.h
@@ -222,6 +222,10 @@ class CC_EXPORT LayerTreeHostImpl
   // for draw properties, tilings, quads and render passes.
   gfx::Size DrawViewportSize() const;
 
+  // Viewport rect in screen space used for tiling prioritization.
+  gfx::Rect ExternalTilingRect() const;

[enne (OOO), 2014/07/24 19:25:19]

bikeshed: "TilingRect" is a really ambiguous phrase in cc.  It's not always
external, either.  Maybe call this DeviceViewportRect(ForTiling) or
ViewportRectForTilePriority that you call it in PictureLayerImpl?

+  const gfx::Transform& ExternalTilingTransform() const;
+
   // Viewport size for scrolling and fixed-position compensation. This value
   // excludes the URL bar and non-overlay scrollbars and is in DIP (and
   // invariant relative to page scale).
@@ -253,6 +257,8 @@ class CC_EXPORT LayerTreeHostImpl
       const gfx::Transform& transform,
       const gfx::Rect& viewport,
       const gfx::Rect& clip,
+      const gfx::Rect& external_tiling_rect,
+      const gfx::Transform& external_tiling_transform,
       bool resourceless_software_draw) OVERRIDE;
   virtual void DidLoseOutputSurface() OVERRIDE;
   virtual void DidSwapBuffers() OVERRIDE;
@@ -666,6 +672,8 @@ class CC_EXPORT LayerTreeHostImpl
   gfx::Transform external_transform_;
   gfx::Rect external_viewport_;
   gfx::Rect external_clip_;
+  gfx::Rect external_tiling_rect_;
+  gfx::Transform external_tiling_transform_;
   bool resourceless_software_draw_;
 
   gfx::Rect viewport_damage_rect_;