ui: No more TestCompositor. Use NullDraw contexts in unit tests.

ui/snapshot/snapshot_aura_unittest.cc

 // Copyright (c) 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 "ui/snapshot/snapshot.h"
 
 #include "base/bind.h"
 #include "base/test/test_simple_task_runner.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "ui/aura/root_window.h"
 #include "ui/aura/test/aura_test_helper.h"
 #include "ui/aura/test/test_screen.h"
 #include "ui/aura/test/test_window_delegate.h"
 #include "ui/aura/test/test_windows.h"
 #include "ui/aura/window.h"
 #include "ui/compositor/layer.h"
+#include "ui/compositor/test/context_factories_for_test.h"
 #include "ui/compositor/test/draw_waiter_for_test.h"
 #include "ui/gfx/canvas.h"
 #include "ui/gfx/gfx_paths.h"
 #include "ui/gfx/image/image.h"
 #include "ui/gfx/rect.h"
 #include "ui/gfx/size_conversions.h"
 #include "ui/gfx/transform.h"
 #include "ui/gl/gl_implementation.h"
 
 namespace ui {
@@ skipping 49 matching lines @@
 
 }  // namespace
 
 class SnapshotAuraTest : public testing::Test {
  public:
   SnapshotAuraTest() {}
   virtual ~SnapshotAuraTest() {}
 
   virtual void SetUp() OVERRIDE {
     testing::Test::SetUp();
+
+    // The ContextFactory must exist before any Compositors are created.
+    // Snapshot test tests real drawing and readback, so needs pixel output.
+    bool enable_pixel_output = true;
+    ui::InitializeContextFactoryForTests(enable_pixel_output);
+
     helper_.reset(
         new aura::test::AuraTestHelper(base::MessageLoopForUI::current()));
-    // Snapshot test tests real drawing and readback, so needs a real context.
-    bool allow_test_contexts = false;
-    helper_->SetUp(allow_test_contexts);
+    helper_->SetUp();
   }
 
   virtual void TearDown() OVERRIDE {
     test_window_.reset();
     delegate_.reset();
     helper_->RunAllPendingInMessageLoop();
     helper_->TearDown();
+    ui::TerminateContextFactoryForTests();
     testing::Test::TearDown();
   }
 
  protected:
   aura::Window* test_window() { return test_window_.get(); }
   aura::Window* root_window() { return helper_->root_window(); }
   aura::WindowEventDispatcher* dispatcher() { return helper_->dispatcher(); }
   aura::TestScreen* test_screen() { return helper_->test_screen(); }
 
   void WaitForDraw() {
@@ skipping 165 matching lines @@
   gfx::SizeF snapshot_size(test_bounds.size());
   snapshot_size.Scale(2.0f);
 
   gfx::Image snapshot = GrabSnapshotForTestWindow();
   EXPECT_EQ(gfx::ToRoundedSize(snapshot_size).ToString(),
             snapshot.Size().ToString());
   EXPECT_EQ(0u, GetFailedPixelsCountWithScaleFactor(snapshot, 2));
 }
 
 }  // namespace ui