aura: fix fullscreen pepper flash

content/renderer/render_widget_fullscreen_pepper.cc

 // Copyright (c) 2011 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/renderer/render_widget_fullscreen_pepper.h"
 
 #include "base/bind.h"
 #include "base/message_loop.h"
 #include "content/common/view_messages.h"
 #include "content/renderer/gpu/gpu_channel_host.h"
@@ skipping 406 matching lines @@
 const float kTexCoords[] = {
     0.f, 0.f,
     0.f, 2.f,
     2.f, 0.f,
 };
 
 }  // anonymous namespace
 
 bool RenderWidgetFullscreenPepper::InitContext() {
   gpu::gles2::GLES2Implementation* gl = context_->GetImplementation();
+  gl->ResizeCHROMIUM(size().width(), size().height());
+  gl->Viewport(0, 0, size().width(), size().height());
+
   program_ = gl->CreateProgram();
 
   GLuint vertex_shader =
       CreateShaderFromSource(gl, GL_VERTEX_SHADER, kVertexShader);
   if (!vertex_shader)
     return false;
   gl->AttachShader(program_, vertex_shader);
   gl->DeleteShader(vertex_shader);
 
   GLuint fragment_shader =
@@ skipping 74 matching lines @@
 
 RendererGLContext*
 RenderWidgetFullscreenPepper::GetParentContextForPlatformContext3D() {
   if (!context_) {
     CreateContext();
   }
   if (!context_)
     return NULL;
   return context_;
 }