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

ui/views/test/views_test_base.cc

Index: ui/views/test/views_test_base.cc
diff --git a/ui/views/test/views_test_base.cc b/ui/views/test/views_test_base.cc
index 37085e38acfd9413ff70475990da7a03873a261d..23539f7c639b0cec318a5cfc84171138d5a2951a 100644
--- a/ui/views/test/views_test_base.cc
+++ b/ui/views/test/views_test_base.cc
@@ -12,6 +12,7 @@
 #include "ui/aura/env.h"
 #include "ui/aura/root_window.h"
 #include "ui/aura/test/aura_test_helper.h"
+#include "ui/compositor/test/context_factories_for_test.h"
 #include "ui/views/corewm/capture_controller.h"
 #include "ui/views/corewm/wm_state.h"
 #endif
@@ -36,9 +37,12 @@ void ViewsTestBase::SetUp() {
   if (!views_delegate_.get())
     views_delegate_.reset(new TestViewsDelegate());
 #if defined(USE_AURA)
+  // The ContextFactory must exist before any Compositors are created.
+  bool enable_pixel_output = false;
+  ui::InitializeContextFactoryForTests(enable_pixel_output);
+
   aura_test_helper_.reset(new aura::test::AuraTestHelper(&message_loop_));
-  bool allow_test_contexts = true;
-  aura_test_helper_->SetUp(allow_test_contexts);
+  aura_test_helper_->SetUp();
   wm_state_.reset(new views::corewm::WMState);
 #endif  // USE_AURA
   ui::InitializeInputMethodForTesting();
@@ -56,6 +60,7 @@ void ViewsTestBase::TearDown() {
   ui::ShutdownInputMethodForTesting();
 #if defined(USE_AURA)
   aura_test_helper_->TearDown();
+  ui::TerminateContextFactoryForTests();
   wm_state_.reset();
   CHECK(!corewm::ScopedCaptureClient::IsActive());
 #endif  // USE_AURA