Fix crash without GPU in test_plugin.cc

components/test_runner/test_plugin.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 "components/test_runner/test_plugin.h"
 
 #include <stddef.h>
 #include <stdint.h>
 #include <utility>
 
@@ skipping 157 matching lines @@
         std::string("TestPlugin: canCreateWithoutRenderer\n"));
 }
 
 TestPlugin::~TestPlugin() {
 }
 
 bool TestPlugin::initialize(blink::WebPluginContainer* container) {
   blink::WebGraphicsContext3D::Attributes attrs;
   context_ =
       blink::Platform::current()->createOffscreenGraphicsContext3D(attrs);
-  gl_ = context_->getGLES2Interface();
+  gl_ = context_ ? context_->getGLES2Interface() : nullptr;
 
   if (!InitScene())
     return false;
 
   layer_ = cc::TextureLayer::CreateForMailbox(this);
   web_layer_ = make_scoped_ptr(new cc_blink::WebLayerImpl(layer_));
   container_ = container;
   container_->setWebLayer(web_layer_.get());
   if (re_request_touch_events_) {
     container_->requestTouchEventType(
@@ skipping 543 matching lines @@
   return kPluginPersistsMimeType;
 }
 
 bool TestPlugin::IsSupportedMimeType(const blink::WebString& mime_type) {
   return mime_type == TestPlugin::MimeType() ||
          mime_type == PluginPersistsMimeType() ||
          mime_type == CanCreateWithoutRendererMimeType();
 }
 
 }  // namespace test_runner