Hold a reference to any kind of context in WindowAndroid.

ui/android/resources/resource_manager_impl_unittest.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 "cc/resources/ui_resource_bitmap.h"
 #include "cc/test/fake_layer_tree_host_client.h"
 #include "cc/test/test_task_graph_runner.h"
 #include "cc/trees/layer_tree_host.h"
 #include "testing/gmock/include/gmock/gmock.h"
 #include "testing/gtest/include/gtest/gtest.h"
@@ skipping 16 matching lines @@
 using ::testing::SaveArg;
 using ::testing::SetArrayArgument;
 using ::testing::SetArgPointee;
 using ::testing::StrEq;
 using ::testing::StrictMock;
 
 namespace ui {
 
 class TestResourceManagerImpl : public ResourceManagerImpl {
  public:
-  TestResourceManagerImpl() {}
+  TestResourceManagerImpl()
+      : ResourceManagerImpl(base::android::GetApplicationContext()) {}
+
   ~TestResourceManagerImpl() override {}
 
   void SetResourceAsLoaded(AndroidResourceType res_type, int res_id) {
     SkBitmap small_bitmap;
     SkCanvas canvas(small_bitmap);
     small_bitmap.allocPixels(
         SkImageInfo::Make(1, 1, kRGBA_8888_SkColorType, kOpaque_SkAlphaType));
     canvas.drawColor(SK_ColorWHITE);
     small_bitmap.setImmutable();
 
@@ skipping 75 matching lines @@
   const cc::UIResourceId kResourceId = 99;
   PreloadResource(kTestResourceType);
   EXPECT_CALL(*host_.get(), CreateUIResource(_))
       .WillOnce(Return(kResourceId))
       .RetiresOnSaturation();
   SetResourceAsLoaded(kTestResourceType);
   EXPECT_EQ(kResourceId, GetUIResourceId(kTestResourceType));
 }
 
 }  // namespace ui