glBindTexImage2DCHROMIUM should retain pixel format.

ui/gl/gl_image_stub.cc

Index: ui/gl/gl_image_stub.cc
diff --git a/ui/gl/gl_image_stub.cc b/ui/gl/gl_image_stub.cc
index 1c8e469745f984a75206d220c4e691b6b925dec0..6549e890faf9189da86f235c38f8ccb69b229626 100644
--- a/ui/gl/gl_image_stub.cc
+++ b/ui/gl/gl_image_stub.cc
@@ -4,6 +4,8 @@
 
 #include "ui/gl/gl_image_stub.h"
 
+#include <GL/gl.h>
+
 namespace gfx {
 
 GLImageStub::GLImageStub() {}
@@ -12,6 +14,8 @@ GLImageStub::~GLImageStub() {}
 
 gfx::Size GLImageStub::GetSize() { return gfx::Size(1, 1); }
 
+unsigned GLImageStub::GetInternalFormat() { return GL_RGBA; }
+
 bool GLImageStub::BindTexImage(unsigned target) { return true; }
 
 bool GLImageStub::CopyTexImage(unsigned target) { return true; }