Unit Test for WebView animating in and out of screen

android_webview/browser/test/fake_window.cc

 // Copyright 2014 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/test/fake_window.h"
 
 #include "android_webview/browser/browser_view_renderer.h"
 #include "android_webview/public/browser/draw_gl.h"
 #include "base/message_loop/message_loop_proxy.h"
 #include "base/synchronization/waitable_event.h"
@@ skipping 101 matching lines @@
   base::MessageLoopProxy::current()->PostTask(
       FROM_HERE,
       base::Bind(&FakeWindow::OnDrawHardware, weak_ptr_factory_.GetWeakPtr()));
 }
 
 void FakeWindow::OnDrawHardware() {
   CheckCurrentlyOnUIThread();
   DCHECK(on_draw_hardware_pending_);
   on_draw_hardware_pending_ = false;
 
+  view_->PrepareToDraw(gfx::Vector2d(), location_);
   hooks_->WillOnDraw();
-  view_->PrepareToDraw(gfx::Vector2d(), location_);
   bool success = view_->OnDrawHardware();
   hooks_->DidOnDraw(success);
   if (success) {
     CreateRenderThreadIfNeeded();
 
     base::WaitableEvent completion(true, false);
     render_thread_loop_->PostTask(
         FROM_HERE, base::Bind(&FakeWindow::DrawFunctorOnRT,
                               base::Unretained(this), &completion));
     completion.Wait();
@@ skipping 39 matching lines @@
   draw_info.transform[8] = 0.0;
   draw_info.transform[9] = 0.0;
   draw_info.transform[10] = 1.0;
   draw_info.transform[11] = 0.0;
 
   draw_info.transform[12] = 0.0;
   draw_info.transform[13] = 0.0;
   draw_info.transform[14] = 0.0;
   draw_info.transform[15] = 1.0;
 
-  hooks_->WillDrawOnRT(functor_);
+  if (!hooks_->WillDrawOnRT(functor_))
+    return;
+
   {
     ScopedMakeCurrent make_current(this);
     functor_->DrawGL(&draw_info);
   }
   hooks_->DidDrawOnRT(functor_);
 }
 
 void FakeWindow::CheckCurrentlyOnUIThread() {
   DCHECK(ui_checker_.CalledOnValidSequencedThread());
 }
@@ skipping 37 matching lines @@
     surface_ = nullptr;
   }
   sync->Signal();
 }
 
 void FakeWindow::CheckCurrentlyOnRT() {
   DCHECK(rt_checker_.CalledOnValidSequencedThread());
 }
 
 }  // namespace android_webview