cc: Consolidate the analysis_canvas operations

cc/picture_pile_impl.h

Index: cc/picture_pile_impl.h
diff --git a/cc/picture_pile_impl.h b/cc/picture_pile_impl.h
index 157f9e21e6280d5a7a8ae423145caa45d92af43b..7e637ad83858bfe40dd486042c668043ed576aa3 100644
--- a/cc/picture_pile_impl.h
+++ b/cc/picture_pile_impl.h
@@ -49,7 +49,18 @@ class CC_EXPORT PicturePileImpl : public PicturePileBase {
     slow_down_raster_scale_factor_for_debug_ = factor;
   }
 
-  bool IsCheapInRect(gfx::Rect content_rect, float contents_scale) const;
+  struct Analysis {
+    Analysis();
+
+    bool is_solid_color;
+    bool is_transparent;

[Sami, 2013/03/05 20:18:31]

Could we call this something like is_empty instead? I'm thinking that we could
check for full opaqueness and have something like a is_fully_opaque flag here
and that could get confusing.

+    bool is_cheap_to_raster;
+    SkColor solid_color;
+  };
+
+  void AnalyzeInRect(const gfx::Rect& content_rect,
+                     float contents_scale,
+                     Analysis* analysis);
 
  protected:
   friend class PicturePile;