Adding public API method on SkImage for extracting the GPU texture handle.

include/core/SkImage.h

Index: include/core/SkImage.h
===================================================================
--- include/core/SkImage.h	(revision 8915)
+++ include/core/SkImage.h	(working copy)
@@ -71,6 +71,7 @@
     int width() const { return fWidth; }
     int height() const { return fHeight; }
     uint32_t uniqueID() const { return fUniqueID; }

[reed1, 2013/04/30 16:17:45]

/**
 * Return a grtexture if the image is backed blah blah blah. Ownership rules
blah blah blah. Will return null for other image types blah balh.
 */

+    GrTexture* getTexture();
 
     SkShader*   newShaderClamp() const;
     SkShader*   newShader(SkShader::TileMode, SkShader::TileMode) const;