Initialize GPU shader disk cache on brower thread.

content/browser/renderer_host/render_widget_host_view_android.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/browser/renderer_host/render_widget_host_view_android.h"
 
 #include <android/bitmap.h>
 
 #include "base/android/build_info.h"
 #include "base/basictypes.h"
@@ skipping 1521 matching lines @@
 
 // TODO(jrg): Find out the implications and answer correctly here,
 // as we are returning the WebView and not root window bounds.
 gfx::Rect RenderWidgetHostViewAndroid::GetBoundsInRootWindow() {
   return GetViewBounds();
 }
 
 gfx::GLSurfaceHandle RenderWidgetHostViewAndroid::GetCompositingSurface() {
   gfx::GLSurfaceHandle handle =
       gfx::GLSurfaceHandle(gfx::kNullPluginWindow, gfx::NULL_TRANSPORT);
-  if (using_browser_compositor_) {
+  // Null check for when we're running inside content_unittests.
+  if (using_browser_compositor_ && BrowserGpuChannelHostFactory::instance()) {
     handle.parent_client_id =
         BrowserGpuChannelHostFactory::instance()->GetGpuChannelId();
   }
   return handle;
 }
 
 void RenderWidgetHostViewAndroid::ProcessAckedTouchEvent(
     const TouchEventWithLatencyInfo& touch, InputEventAckState ack_result) {
   const bool event_consumed = ack_result == INPUT_EVENT_ACK_STATE_CONSUMED;
   gesture_provider_.OnTouchEventAck(touch.event.uniqueTouchEventId,
@@ skipping 464 matching lines @@
   results->orientationAngle = display.RotationAsDegree();
   results->orientationType =
       RenderWidgetHostViewBase::GetOrientationTypeForMobile(display);
   gfx::DeviceDisplayInfo info;
   results->depth = info.GetBitsPerPixel();
   results->depthPerComponent = info.GetBitsPerComponent();
   results->isMonochrome = (results->depthPerComponent == 0);
 }
 
 } // namespace content