[Large Icon Service] Move icon resizing into worker thread.

components/favicon/core/large_icon_service_unittest.cc

 // Copyright 2015 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 "components/favicon/core/large_icon_service.h"
 
 #include <deque>
 
 #include "base/bind.h"
 #include "base/memory/ref_counted_memory.h"
@@ skipping 64 matching lines @@
 
   void InjectResult(const favicon_base::FaviconRawBitmapResult& mock_result) {
     mock_result_queue_.push_back(mock_result);
   }
 
   bool HasUnusedResults() {
     return !mock_result_queue_.empty();
   }
 
  private:
+  std::deque<favicon_base::FaviconRawBitmapResult> mock_result_queue_;
+
   DISALLOW_COPY_AND_ASSIGN(MockFaviconService);
-
-  std::deque<favicon_base::FaviconRawBitmapResult> mock_result_queue_;
 };
 
 // This class provides access to LargeIconService internals.
 class TestLargeIconService : public LargeIconService {
  public:
   explicit TestLargeIconService(MockFaviconService* mock_favicon_service)
       : LargeIconService(mock_favicon_service) {
   }
   ~TestLargeIconService() override {
   }
 
+  // Using the current thread's task runner for testing.
+  scoped_refptr<base::TaskRunner> GetBackgroundTaskRunner() override {
+    return base::MessageLoop::current()->task_runner();
+  }
+
  private:
   DISALLOW_COPY_AND_ASSIGN(TestLargeIconService);
 };
 
 class LargeIconServiceTest : public testing::Test {
  public:
   LargeIconServiceTest() : is_callback_invoked_(false) {
   }
 
   ~LargeIconServiceTest() override {
@@ skipping 36 matching lines @@
   favicon_base::FaviconRawBitmapResult expected_bitmap_;
   scoped_ptr<favicon_base::FallbackIconStyle> expected_fallback_icon_style_;
 
   bool is_callback_invoked_;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(LargeIconServiceTest);
 };
 
 TEST_F(LargeIconServiceTest, SameSize) {
-
   mock_favicon_service_->InjectResult(CreateTestBitmap(24, 24, kTestColor));
   expected_bitmap_ = CreateTestBitmap(24, 24, kTestColor);
   large_icon_service_->GetLargeIconOrFallbackStyle(
       GURL(kDummyUrl),
       24,  // |min_source_size_in_pixel|
       24,  // |desired_size_in_pixel|
       base::Bind(&LargeIconServiceTest::ResultCallback, base::Unretained(this)),
       &cancelable_task_tracker_);
   base::MessageLoop::current()->RunUntilIdle();
   EXPECT_TRUE(is_callback_invoked_);
@@ skipping 106 matching lines @@
       32,
       24,
       base::Bind(&LargeIconServiceTest::ResultCallback, base::Unretained(this)),
       &cancelable_task_tracker_);
   base::MessageLoop::current()->RunUntilIdle();
   EXPECT_TRUE(is_callback_invoked_);
 }
 
 }  // namespace
 }  // namespace favicon