Fix a misuse of framebuffer target in GLHelper.

content/common/gpu/client/gl_helper.cc

 // Copyright (c) 2012 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 "content/common/gpu/client/gl_helper.h"
 
 #include <queue>
 
 #include "base/bind.h"
 #include "base/lazy_instance.h"
@@ skipping 529 matching lines @@
     // lock, and we'll exit early, or we ensure that the texture is bound to the
     // framebuffer before the main thread has a chance to delete it.
     base::AutoLock auto_lock(request->lock);
     if (!request->texture || !request->pixels)
       return;
     pixels = request->pixels;
     request->pixels = NULL;
     size = request->size;
     {
       ScopedFlush flush(context);
-      ScopedFramebufferBinder<GL_DRAW_FRAMEBUFFER> framebuffer_binder(
+      ScopedFramebufferBinder<GL_READ_FRAMEBUFFER> framebuffer_binder(
           context, dst_framebuffer);
       ScopedTextureBinder<GL_TEXTURE_2D> texture_binder(
           context, request->texture);
-      context->framebufferTexture2D(GL_DRAW_FRAMEBUFFER,
+      context->framebufferTexture2D(GL_READ_FRAMEBUFFER,
                                     GL_COLOR_ATTACHMENT0,
                                     GL_TEXTURE_2D,
                                     request->texture,
                                     0);
     }
   }
   bool result = context->readBackFramebuffer(
         pixels,
         4 * size.GetArea(),
         dst_framebuffer.id(),
@@ skipping 108 matching lines @@
   WebKit::WGC3Dint compile_status = 0;
   context_->getShaderiv(shader, GL_COMPILE_STATUS, &compile_status);
   if (!compile_status) {
     LOG(ERROR) << std::string(context_->getShaderInfoLog(shader).utf8());
     return 0;
   }
   return shader.Detach();
 }
 
 }  // namespace content