glBindTexImage2DCHROMIUM should retain pixel format.

ui/gl/gl_image_io_surface.cc

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ui/gl/gl_image_io_surface.h"
 
 #include "ui/gl/gl_bindings.h"
 #include "ui/gl/gl_context.h"
 
 // Note that this must be included after gl_bindings.h to avoid conflicts.
@@ skipping 132 matching lines @@
   return true;
 }
 
 void GLImageIOSurface::Destroy(bool have_context) {
   DCHECK(thread_checker_.CalledOnValidThread());
   io_surface_.reset();
 }
 
 gfx::Size GLImageIOSurface::GetSize() { return size_; }
 
+unsigned GLImageIOSurface::GetFormat() { return internalformat_; }
+
 bool GLImageIOSurface::BindTexImage(unsigned target) {
   DCHECK(thread_checker_.CalledOnValidThread());
   if (target != GL_TEXTURE_RECTANGLE_ARB) {
     // This might be supported in the future. For now, perform strict
     // validation so we know what's going on.
     LOG(ERROR) << "IOSurface requires TEXTURE_RECTANGLE_ARB target";
     return false;
   }
 
   CGLContextObj cgl_context =
@@ skipping 18 matching lines @@
 
 bool GLImageIOSurface::ScheduleOverlayPlane(gfx::AcceleratedWidget widget,
                                             int z_order,
                                             OverlayTransform transform,
                                             const Rect& bounds_rect,
                                             const RectF& crop_rect) {
   return false;
 }
 
 }  // namespace gfx