Reland: Notifications: Split up image loading histograms by image type

third_party/WebKit/Source/modules/notifications/NotificationImageLoaderTest.cpp

 // Copyright 2016 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 "modules/notifications/NotificationImageLoader.h"
 
 #include "core/dom/ExecutionContext.h"
 #include "core/fetch/MemoryCache.h"
 #include "core/testing/DummyPageHolder.h"
+#include "platform/testing/HistogramTester.h"
 #include "platform/testing/TestingPlatformSupport.h"
 #include "platform/testing/URLTestHelpers.h"
 #include "public/platform/Platform.h"
 #include "public/platform/WebURL.h"
 #include "public/platform/WebURLLoaderMockFactory.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "third_party/WebKit/Source/platform/weborigin/KURL.h"
 #include "third_party/skia/include/core/SkBitmap.h"
 #include "wtf/Functional.h"
 
 namespace blink {
 namespace {
 
 enum class LoadState { kNotLoaded, kLoadFailed, kLoadSuccessful };
 
 const char kBaseUrl[] = "http://test.com/";
 const char kIcon500x500[] = "500x500.png";
 
 // This mirrors the definition in NotificationImageLoader.cpp.
 const unsigned long kImageFetchTimeoutInMs = 90000;
 
 static_assert(kImageFetchTimeoutInMs > 1000.0,
               "kImageFetchTimeoutInMs must be greater than 1000ms.");
 
 class NotificationImageLoaderTest : public ::testing::Test {
  public:
   NotificationImageLoaderTest()
       : m_page(DummyPageHolder::create()),
-        m_loader(new NotificationImageLoader()) {}
+        // Use an arbitrary type, since it only affects which UMA bucket we use.
+        m_loader(
+            new NotificationImageLoader(NotificationImageLoader::Type::Icon)) {}
 
   ~NotificationImageLoaderTest() override {
     m_loader->stop();
     Platform::current()->getURLLoaderMockFactory()->unregisterAllURLs();
     memoryCache()->evictResources();
   }
 
   // Registers a mocked URL. When fetched it will be loaded form the test data
   // directory.
   WebURL registerMockedURL(const String& fileName) {
@@ skipping 14 matching lines @@
 
   void loadImage(const KURL& url) {
     m_loader->start(
         context(), url,
         bind(&NotificationImageLoaderTest::imageLoaded, WTF::unretained(this)));
   }
 
   ExecutionContext* context() const { return &m_page->document(); }
   LoadState loaded() const { return m_loaded; }
 
+ protected:
+  HistogramTester m_histogramTester;
+
  private:
   std::unique_ptr<DummyPageHolder> m_page;
   Persistent<NotificationImageLoader> m_loader;
   LoadState m_loaded = LoadState::kNotLoaded;
 };
 
 TEST_F(NotificationImageLoaderTest, SuccessTest) {
   KURL url = registerMockedURL(kIcon500x500);
   loadImage(url);
+  m_histogramTester.expectTotalCount("Notifications.LoadFinishTime.Icon", 0);
+  m_histogramTester.expectTotalCount("Notifications.LoadFileSize.Icon", 0);
+  m_histogramTester.expectTotalCount("Notifications.LoadFailTime.Icon", 0);
   Platform::current()->getURLLoaderMockFactory()->serveAsynchronousRequests();
   EXPECT_EQ(LoadState::kLoadSuccessful, loaded());
+  m_histogramTester.expectTotalCount("Notifications.LoadFinishTime.Icon", 1);
+  m_histogramTester.expectUniqueSample("Notifications.LoadFileSize.Icon", 7439,
+                                       1);
+  m_histogramTester.expectTotalCount("Notifications.LoadFailTime.Icon", 0);
 }
 
 TEST_F(NotificationImageLoaderTest, TimeoutTest) {
   // To test for a timeout, this needs to override the clock in the platform.
   // Just creating the mock platform will do everything to set it up.
   TestingPlatformSupportWithMockScheduler testingPlatform;
   KURL url = registerMockedURL(kIcon500x500);
   loadImage(url);
 
   // Run the platform for kImageFetchTimeoutInMs-1 seconds. This should not
   // result in a timeout.
   testingPlatform.runForPeriodSeconds(kImageFetchTimeoutInMs / 1000 - 1);
   EXPECT_EQ(LoadState::kNotLoaded, loaded());
+  m_histogramTester.expectTotalCount("Notifications.LoadFinishTime.Icon", 0);
+  m_histogramTester.expectTotalCount("Notifications.LoadFileSize.Icon", 0);
+  m_histogramTester.expectTotalCount("Notifications.LoadFailTime.Icon", 0);
 
   // Now advance time until a timeout should be expected.
   testingPlatform.runForPeriodSeconds(2);
 
   // If the loader times out, it calls the callback and returns an empty bitmap.
   EXPECT_EQ(LoadState::kLoadFailed, loaded());
+  m_histogramTester.expectTotalCount("Notifications.LoadFinishTime.Icon", 0);
+  m_histogramTester.expectTotalCount("Notifications.LoadFileSize.Icon", 0);
+  // Should log a non-zero failure time.
+  m_histogramTester.expectTotalCount("Notifications.LoadFailTime.Icon", 1);
+  m_histogramTester.expectBucketCount("Notifications.LoadFailTime.Icon", 0, 0);
 }
 
 }  // namspace
 }  // namespace blink