Add smoothness test for hover during trackpad scrolling.

The results of this test will improve dramatically when
crbug.com/317007 is fixed.

BUG=317007

Review URL: https://codereview.chromium.org/1157093002

Cr-Commit-Position: refs/heads/master@{#333044}

content/renderer/gpu/gpu_benchmarking_extension.cc

@@ -289,6 +289,22 @@ bool BeginSmoothScroll(v8::Isolate* isolate,
   if (!context.Init(false))
     return false;
 
+  // Convert coordinates from CSS pixels to density independent pixels (DIPs).
+  float page_scale_factor = context.web_view()->pageScaleFactor();
+
+  if (gesture_source_type == SyntheticGestureParams::MOUSE_INPUT) {
+    // Ensure the mouse is centered and visible, in case it will
+    // trigger any hover or mousemove effects.
+    blink::WebRect contentRect =
+        context.web_view()->mainFrame()->visibleContentRect();
+    blink::WebMouseEvent mouseMove;
+    mouseMove.type = blink::WebInputEvent::MouseMove;
+    mouseMove.x = (contentRect.x + contentRect.width / 2) * page_scale_factor;
+    mouseMove.y = (contentRect.y + contentRect.height / 2) * page_scale_factor;
+    context.web_view()->handleInputEvent(mouseMove);
+    context.web_view()->setCursorVisibilityState(true);
+  }
+
   scoped_refptr<CallbackAndContext> callback_and_context =
       new CallbackAndContext(
           isolate, callback, context.web_frame()->mainWorldScriptContext());
@@ -296,9 +312,6 @@ bool BeginSmoothScroll(v8::Isolate* isolate,
   scoped_ptr<SyntheticSmoothScrollGestureParams> gesture_params(
       new SyntheticSmoothScrollGestureParams);
 
-  // Convert coordinates from CSS pixels to density independent pixels (DIPs).
-  float page_scale_factor = context.web_view()->pageScaleFactor();
-
   if (gesture_source_type < 0 ||
       gesture_source_type > SyntheticGestureParams::GESTURE_SOURCE_TYPE_MAX) {
     return false;

tools/perf/page_sets/key_desktop_move_cases.py

@@ -84,7 +84,7 @@ class GmailMouseScrollPage(KeyDesktopMoveCasesPage):
 
 class GoogleMapsPage(KeyDesktopMoveCasesPage):
 
-  """ Why: productivity, top google properties; Supports drag gesturee """
+  """ Why: productivity, top google properties; Supports drag gestures """
 
   def __init__(self, page_set):
     super(GoogleMapsPage, self).__init__(

tools/perf/page_sets/tough_scrolling_cases.py

 # 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.
+from telemetry.internal.actions import page_action
 from telemetry.page import page as page_module
 from telemetry.page import page_set as page_set_module
 
 
 class ToughFastScrollingCasesPage(page_module.Page):
 
-  def __init__(self, url, name, speed_in_pixels_per_second, page_set):
+  def __init__(self, url, name, speed_in_pixels_per_second, page_set,
+               synthetic_gesture_source):
     super(ToughFastScrollingCasesPage, self).__init__(
       url=url,
       page_set=page_set,
       name=name)
     self.speed_in_pixels_per_second = speed_in_pixels_per_second
+    self.synthetic_gesture_source = synthetic_gesture_source
 
   def RunPageInteractions(self, action_runner):
     with action_runner.CreateGestureInteraction('ScrollAction'):
       action_runner.ScrollPage(
           direction='down',
-          speed_in_pixels_per_second=self.speed_in_pixels_per_second)
+          speed_in_pixels_per_second=self.speed_in_pixels_per_second,
+          synthetic_gesture_source=self.synthetic_gesture_source)
 
 class ToughScrollingCasesPageSet(page_set_module.PageSet):
 
@@ -31,6 +35,7 @@ class ToughScrollingCasesPageSet(page_set_module.PageSet):
 
     fast_scrolling_page_name_list = [
       'text',
+      'text_hover',
       'canvas'
     ]
 
@@ -40,8 +45,12 @@ class ToughScrollingCasesPageSet(page_set_module.PageSet):
 
     for name in fast_scrolling_page_name_list:
       for speed in fast_scrolling_speed_list:
+        synthetic_gesture_source = page_action.GESTURE_SOURCE_DEFAULT
+        if "hover" in name:
+          synthetic_gesture_source = page_action.GESTURE_SOURCE_MOUSE
         self.AddUserStory(ToughFastScrollingCasesPage(
           'file://tough_scrolling_cases/' + name + '.html',
           name + '_' + str(speed).zfill(5) + '_pixels_per_second',
           speed,
-          self))
+          self,
+          synthetic_gesture_source))