Move logic of recording main thread scrolling reasons from cc to blink::ScrollManager

third_party/WebKit/Source/core/input/EventHandlerTest.cpp

 // 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 "core/input/EventHandler.h"
 
 #include <memory>
 #include "core/dom/Document.h"
 #include "core/dom/Range.h"
 #include "core/editing/Editor.h"
 #include "core/editing/FrameSelection.h"
 #include "core/frame/FrameView.h"
 #include "core/frame/LocalFrame.h"
 #include "core/frame/Settings.h"
 #include "core/loader/EmptyClients.h"
 #include "core/page/AutoscrollController.h"
 #include "core/page/Page.h"
 #include "core/testing/DummyPageHolder.h"
+#include "platform/testing/HistogramTester.h"
+#include "testing/gmock/include/gmock/gmock.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace blink {
 
 class EventHandlerTest : public ::testing::Test {
  protected:
   void SetUp() override;
 
   Page& page() const { return m_dummyPageHolder->page(); }
   Document& document() const { return m_dummyPageHolder->document(); }
@@ skipping 425 matching lines @@
       WebInputEvent::MouseUp, WebFloatPoint(100, 50), WebFloatPoint(200, 250),
       WebPointerProperties::Button::Left, 1, WebInputEvent::NoModifiers,
       TimeTicks::Now().InSeconds());
   mouseUpEvent.setFrameScale(1);
   document().frame()->eventHandler().dragSourceEndedAt(mouseUpEvent,
                                                        DragOperationNone);
 
   // This test passes if it doesn't crash.
 }
 
+TEST_F(EventHandlerTest, MainThreadScrollingReasonRecordTest) {
+  HistogramTester histogramTester;
+  // Test wheel scroll
+  ScrollManager* scrollManager = new ScrollManager(*(document().frame()));
+  scrollManager->recordMainThreadScrollingReasons(
+      MainThreadScrollingReason::kHasBackgroundAttachmentFixedObjects |
+          MainThreadScrollingReason::kThreadedScrollingDisabled |
+          MainThreadScrollingReason::kPageOverlay |
+          MainThreadScrollingReason::kHandlingScrollFromMainThread,
+      WebGestureDeviceTouchpad);
+
+  histogramTester.expectBucketCount("Renderer4.MainThreadWheelScrollReason", 1,
+                                    1);
+  histogramTester.expectBucketCount("Renderer4.MainThreadWheelScrollReason", 3,
+                                    1);
+  histogramTester.expectBucketCount("Renderer4.MainThreadWheelScrollReason", 5,
+                                    1);
+
+  // We only want to record "Handling scroll from main thread" reason if it's
+  // the only reason. If it's not the only reason, the "real" reason for
+  // scrolling on main is something else, and we only want to pay attention to
+  // that reason. So we should only include this reason in the histogram when
+  // its on its own.
+  scrollManager->recordMainThreadScrollingReasons(
+      MainThreadScrollingReason::kHandlingScrollFromMainThread,
+      blink::WebGestureDeviceTouchpad);
+
+  histogramTester.expectBucketCount("Renderer4.MainThreadWheelScrollReason", 1,
+                                    1);
+  histogramTester.expectBucketCount("Renderer4.MainThreadWheelScrollReason", 3,
+                                    1);
+  histogramTester.expectBucketCount("Renderer4.MainThreadWheelScrollReason", 5,
+                                    1);
+  histogramTester.expectBucketCount("Renderer4.MainThreadWheelScrollReason", 14,
+                                    1);
+
+  scrollManager->recordMainThreadScrollingReasons(
+      MainThreadScrollingReason::kHasBackgroundAttachmentFixedObjects |
+          MainThreadScrollingReason::kThreadedScrollingDisabled |
+          MainThreadScrollingReason::kPageOverlay |
+          MainThreadScrollingReason::kHandlingScrollFromMainThread,
+      WebGestureDeviceTouchpad);
+
+  histogramTester.expectBucketCount("Renderer4.MainThreadWheelScrollReason", 1,
+                                    2);
+  histogramTester.expectBucketCount("Renderer4.MainThreadWheelScrollReason", 3,
+                                    2);
+  histogramTester.expectBucketCount("Renderer4.MainThreadWheelScrollReason", 5,
+                                    2);
+  histogramTester.expectBucketCount("Renderer4.MainThreadWheelScrollReason", 14,
+                                    1);
+
+  // Test touch scroll
+  scrollManager->recordMainThreadScrollingReasons(
+      MainThreadScrollingReason::kHasBackgroundAttachmentFixedObjects |
+          MainThreadScrollingReason::kThreadedScrollingDisabled |
+          MainThreadScrollingReason::kPageOverlay |
+          MainThreadScrollingReason::kHandlingScrollFromMainThread,
+      WebGestureDeviceTouchscreen);
+
+  histogramTester.expectBucketCount("Renderer4.MainThreadGestureScrollReason",
+                                    1, 1);
+  histogramTester.expectBucketCount("Renderer4.MainThreadGestureScrollReason",
+                                    3, 1);
+  histogramTester.expectBucketCount("Renderer4.MainThreadGestureScrollReason",
+                                    5, 1);
+
+  scrollManager->recordMainThreadScrollingReasons(
+      MainThreadScrollingReason::kHandlingScrollFromMainThread,
+      blink::WebGestureDeviceTouchscreen);
+
+  histogramTester.expectBucketCount("Renderer4.MainThreadGestureScrollReason",
+                                    1, 1);
+  histogramTester.expectBucketCount("Renderer4.MainThreadGestureScrollReason",
+                                    3, 1);
+  histogramTester.expectBucketCount("Renderer4.MainThreadGestureScrollReason",
+                                    5, 1);
+  histogramTester.expectBucketCount("Renderer4.MainThreadGestureScrollReason",
+                                    14, 1);
+}
+
 class TooltipCapturingChromeClient : public EmptyChromeClient {
  public:
   TooltipCapturingChromeClient() {}
 
   void setToolTip(LocalFrame&, const String& str, TextDirection) override {
     m_lastToolTip = str;
   }
 
   String& lastToolTip() { return m_lastToolTip; }
 
@@ skipping 40 matching lines @@
       WebInputEvent::MouseLeave, WebFloatPoint(0, 0), WebFloatPoint(0, 0),
       WebPointerProperties::Button::NoButton, 0, WebInputEvent::NoModifiers,
       TimeTicks::Now().InSeconds());
   mouseLeaveEvent.setFrameScale(1);
   document().frame()->eventHandler().handleMouseLeaveEvent(mouseLeaveEvent);
 
   EXPECT_EQ(WTF::String(), lastToolTip());
 }
 
 }  // namespace blink