Use a mocked compositor for unit tests

views/run_all_unittests.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 "base/test/test_suite.h"
 #include "ui/base/resource/resource_bundle.h"
 #include "ui/base/ui_base_paths.h"
 #include "views/view.h"
 
+#if defined(OS_LINUX)
+#include "base/command_line.h"
+#include "ui/gfx/gl/gl_switches.h"
+#endif
+
+#if defined(VIEWS_COMPOSITOR)
+#include "ui/gfx/compositor/compositor.h"
+#include "ui/gfx/compositor/test_compositor.h"
+#endif
+
 class ViewTestSuite : public base::TestSuite {
  public:
   ViewTestSuite(int argc, char** argv) : base::TestSuite(argc, argv) {}
 
  protected:
   virtual void Initialize() {
     base::TestSuite::Initialize();
 
     ui::RegisterPathProvider();
     ui::ResourceBundle::InitSharedInstance("en-US");
 
 #if defined(OS_LINUX)
-    // Disable GPU browser compositor during unit tests.
-    views::View::set_use_acceleration_when_possible(false);
+    EXPECT_TRUE(!CommandLine::ForCurrentProcess()->HasSwitch(switches::kUseGL));
+    CommandLine::ForCurrentProcess()->AppendSwitchASCII(
+        switches::kUseGL, gfx::kGLImplementationOSMesaName);
+#endif
+
+#if defined(VIEWS_COMPOSITOR)
+   // Use a mock compositor that noops draws.
+    ui::Compositor::set_compositor_factory_for_testing(
+        ui::TestCompositor::Create);
 #endif
   }
 };
 
 int main(int argc, char** argv) {
   return ViewTestSuite(argc, argv).Run();
 }