glBindTexImage2DCHROMIUM should retain pixel format.

ui/gl/gl_image.h

Index: ui/gl/gl_image.h
diff --git a/ui/gl/gl_image.h b/ui/gl/gl_image.h
index 214241396becbf60949ed713278eb9ee3323c782..d3e9aa076e8c223c1c9db13aeb5475c28996f98e 100644
--- a/ui/gl/gl_image.h
+++ b/ui/gl/gl_image.h
@@ -27,6 +27,9 @@ class GL_EXPORT GLImage : public base::RefCounted<GLImage> {
   // Get the size of the image.
   virtual gfx::Size GetSize() = 0;
 
+  // Get the image pixel format.

[reveman, 2015/05/12 15:27:19]

Internal format is not guaranteed to match the exact pixel format. "Get the
internal format of the image."?

[christiank, 2015/05/13 09:02:23]

Alright, I was debating whether using GetInternalFormat was the right way to go
here. But I was unsure whether the concept existed for GLImage. Should now be
fixed.

+  virtual unsigned GetFormat() = 0;

[reveman, 2015/05/12 15:27:19]

nit: GetInternalFormat() as that's how we refer to this in CHROMIUM_image spec:

https://code.google.com/p/chromium/codesearch#chromium/src/gpu/GLES2/extensio...

+
   // Bind image to texture currently bound to |target|.
   virtual bool BindTexImage(unsigned target) = 0;