Compare SkRegion and android::Region performance.

cc/region.h

Index: cc/region.h
diff --git a/cc/region.h b/cc/region.h
index ec21c65fc9ff2248dff15f9007269ee795cc74fc..db622096f90c0d9450004122789030db15fd77a2 100644
--- a/cc/region.h
+++ b/cc/region.h
@@ -9,9 +9,16 @@
 
 #include "base/logging.h"
 #include "cc/cc_export.h"
-#include "third_party/skia/include/core/SkRegion.h"
 #include "ui/gfx/rect.h"
 
+#define USE_ANDROID_REGION
+
+#ifdef USE_ANDROID_REGION
+#include "cc/android_region.h"
+#else
+#include "third_party/skia/include/core/SkRegion.h"
+#endif
+
 namespace cc {
 
 class CC_EXPORT Region {
@@ -40,10 +47,14 @@ class CC_EXPORT Region {
   void Intersect(gfx::Rect rect);
   void Intersect(const Region& region);
 
-  bool Equals(const Region& other) const { return skregion_ == other.skregion_; }
+  bool Equals(const Region& other) const;
 
   gfx::Rect bounds() const {
+#ifdef USE_ANDROID_REGION
+    SkIRect r = droidregion_.bounds();
+#else
     SkIRect r = skregion_.getBounds();
+#endif
     // TODO(danakj) Use method from ui/gfx/skia_utils.h when it exists.
     return gfx::Rect(r.x(), r.y(), r.width(), r.height());
   }
@@ -56,24 +67,45 @@ class CC_EXPORT Region {
     ~Iterator();
 
     gfx::Rect rect() const {
+#ifdef USE_ANDROID_REGION
+      SkIRect r = *it_;
+#else
       SkIRect r = it_.rect();
+#endif
       // TODO(danakj) Use method from ui/gfx/skia_utils.h when it exists.
       return gfx::Rect(r.x(), r.y(), r.width(), r.height());
     }
 
     void next() {
+#ifdef USE_ANDROID_REGION
+      ++it_;
+#else
       it_.next();
+#endif
     }
     bool has_rect() const {
+#ifdef USE_ANDROID_REGION
+      return it_ != droidregion_.end();
+#else
       return !it_.done();
+#endif
     }
 
    private:
+#ifdef USE_ANDROID_REGION
+    const android::Region& droidregion_;
+    android::Region::const_iterator it_;
+#else
     SkRegion::Iterator it_;
+#endif
   };
 
  private:
+#ifdef USE_ANDROID_REGION
+  android::Region droidregion_;
+#else
   SkRegion skregion_;
+#endif
 };
 
 inline bool operator==(const Region& a, const Region& b) {