aw: Workaround qualcomm driver bug

android_webview/browser/scoped_app_gl_state_restore.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 "android_webview/browser/scoped_app_gl_state_restore.h"
 
 #include <string>
 
 #include "base/debug/trace_event.h"
 #include "base/lazy_instance.h"
@@ skipping 276 matching lines @@
     glGetVertexAttribPointerv(
         i, GL_VERTEX_ATTRIB_ARRAY_POINTER, &vertex_attrib_[i].pointer);
     glGetVertexAttribPointerv(
         i, GL_VERTEX_ATTRIB_ARRAY_POINTER, &vertex_attrib_[i].pointer);
     glGetVertexAttribiv(i,
                         GL_VERTEX_ATTRIB_ARRAY_BUFFER_BINDING,
                         &vertex_attrib_[i].vertex_attrib_array_buffer_binding);
     glGetVertexAttribfv(
         i, GL_CURRENT_VERTEX_ATTRIB, vertex_attrib_[i].current_vertex_attrib);
   }
+
+  // Android 5.0.0 specific qualcomm workaround. See crbug.com/434570.
+  glBindRenderbufferEXT(GL_RENDERBUFFER, 0);
   DCHECK(ClearGLErrors(false, NULL));
 }
 
 ScopedAppGLStateRestoreImpl::~ScopedAppGLStateRestoreImpl() {
   TRACE_EVENT0("android_webview", "AppGLStateRestore");
   MakeAppContextCurrent();
 
   DCHECK(ClearGLErrors(false, NULL));
 
   glBindFramebufferEXT(GL_FRAMEBUFFER, framebuffer_binding_ext_);
@@ skipping 117 matching lines @@
 ScopedAppGLStateRestore::~ScopedAppGLStateRestore() {}
 
 bool ScopedAppGLStateRestore::stencil_enabled() const {
   return impl_->stencil_enabled();
 }
 int ScopedAppGLStateRestore::framebuffer_binding_ext() const {
   return impl_->framebuffer_binding_ext();
 }
 
 }  // namespace android_webview