Force use of and cache render surface.

cc/quads/render_pass.h

Index: cc/quads/render_pass.h
diff --git a/cc/quads/render_pass.h b/cc/quads/render_pass.h
index 0ad8debc8928f0c5d07506d39a0dbd11aa6e070c..84677ee5609236ec69bd3a681ac1bfc8b084263f 100644
--- a/cc/quads/render_pass.h
+++ b/cc/quads/render_pass.h
@@ -85,7 +85,10 @@ class CC_EXPORT RenderPass {
               const FilterOperations& filters,
               const FilterOperations& background_filters,
               const gfx::ColorSpace& color_space,
-              bool has_transparent_background);
+              bool has_transparent_background,
+              bool force_render_surface,
+              bool has_property_change_on_contributing_render_surface,
+              bool has_damage_on_surface_quad);
 
   void AsValueInto(base::trace_event::TracedValue* dict) const;
 
@@ -127,6 +130,14 @@ class CC_EXPORT RenderPass {
   // If false, the pixels in the render pass' texture are all opaque.
   bool has_transparent_background = true;
 
+  // If true we might reuse the texture if there is no damage.
+  bool force_render_surface = false;
+  // A cumulated property changes from the contributing render surface. Not
+  // including property changes on itself.
+  bool has_property_change_on_contributing_render_surface = false;

[weiliangc, 2017/06/07 21:19:00]

We should be able to just combine this and has_damage_on_surface_quad bools
together, since they both indicate has_damage_from_contributing_content.

[wutao, 2017/06/09 02:31:32]

Nice!

+  // If true, indicates containing at least one surface quad with damage.
+  bool has_damage_on_surface_quad = false;
+
   // If non-empty, the renderer should produce a copy of the render pass'
   // contents as a bitmap, and give a copy of the bitmap to each callback in
   // this list. This property should not be serialized between compositors, as