glBindTexImage2DCHROMIUM should retain pixel format.

ui/gl/gl_image_memory.cc

 // Copyright 2014 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_memory.h"
 
 #include "base/logging.h"
 #include "base/trace_event/trace_event.h"
 #include "ui/gl/gl_bindings.h"
 #include "ui/gl/scoped_binders.h"
@@ skipping 220 matching lines @@
     egl_texture_id_ = 0u;
   }
 #endif
   memory_ = NULL;
 }
 
 Size GLImageMemory::GetSize() {
   return size_;
 }
 
+unsigned GLImageMemory::GetFormat() {
+  return internalformat_;
+}
+
 bool GLImageMemory::BindTexImage(unsigned target) {
   if (target_ && target_ != target) {
     LOG(ERROR) << "GLImage can only be bound to one target";
     return false;
   }
   target_ = target;
 
   // Defer DoBindTexImage if not currently in use.
   if (!in_use_) {
     need_do_bind_tex_image_ = true;
@@ skipping 151 matching lines @@
                  size_.width(),
                  size_.height(),
                  0,  // border
                  DataFormat(format_),
                  DataType(format_),
                  memory_);
   }
 }
 
 }  // namespace gfx