Add switch to use ipc command buffer in Android WebView

content/renderer/render_thread_impl.cc

Index: content/renderer/render_thread_impl.cc
diff --git a/content/renderer/render_thread_impl.cc b/content/renderer/render_thread_impl.cc
index 406f137b14345746e4cc0f2c37a3f9b72cd4a6ea..8b7e6425775a5c2c1607abf158ad936d72f6065d 100644
--- a/content/renderer/render_thread_impl.cc
+++ b/content/renderer/render_thread_impl.cc
@@ -1483,8 +1483,9 @@ RenderThreadImpl::SharedMainThreadContextProvider() {
       shared_main_thread_contexts_->DestroyedOnMainThread()) {
     shared_main_thread_contexts_ = NULL;
 #if defined(OS_ANDROID)
-    if (SynchronousCompositorFactory* factory =
-            SynchronousCompositorFactory::GetInstance()) {
+    SynchronousCompositorFactory* factory =
+        SynchronousCompositorFactory::GetInstance();
+    if (factory && factory->OverrideWithFactory()) {
       shared_main_thread_contexts_ = factory->CreateOffscreenContextProvider(
           GetOffscreenAttribs(), "Offscreen-MainThread");
     }