Merge revision 643 and revision 648 changes:

- Improve the cefclient transparency test by adding the ability to view individual pixel values (issue #584).
- Change cefclient off-screen rendering example to account for premultiplied alpha values (issue #584).

git-svn-id: https://chromiumembedded.googlecode.com/svn/branches/1025@649 5089003a-bbd8-11dd-ad1f-f1f9622dbc98

tests/cefclient/osrenderer.h

@@ -40,6 +40,13 @@ class ClientOSRenderer {
   void SetSpin(float spinX, float spinY);
   void IncrementSpin(float spinDX, float spinDY);
 
+  // Retrieve the pixel value from the view buffer. |x| and |y| are relative to
+  // the upper-left corner of the view.
+  bool GetPixelValue(int x, int y, unsigned char& r, unsigned char& g,
+                     unsigned char& b, unsigned char& a);
+
+  bool IsTransparent() { return transparent_; }
+
  private:
   void SetBufferSize(int width, int height, bool view);
   void SetRGBA(const void* src, int width, int height, bool view);