re-land the "SourceEventType added to LatencyInfo."

content/browser/renderer_host/render_widget_host_view_mac.mm

 // Copyright (c) 2012 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 "content/browser/renderer_host/render_widget_host_view_mac.h"
 
 #import <objc/runtime.h>
 #include <OpenGL/gl.h>
 #include <QuartzCore/QuartzCore.h>
 #include <stdint.h>
@@ skipping 1855 matching lines @@
     return;
   }
 
   if (mouseEventWasIgnored_) {
     // If this is the first mouse event after a previous event that was ignored
     // due to the hitTest, send a mouse enter event to the host view.
     if (renderWidgetHostView_->render_widget_host_) {
       WebMouseEvent enterEvent = WebMouseEventBuilder::Build(theEvent, self);
       enterEvent.type = WebInputEvent::MouseMove;
       enterEvent.button = WebMouseEvent::Button::NoButton;
+      ui::LatencyInfo latency_info(ui::SourceEventType::OTHER);
+      latency_info.AddLatencyNumber(ui::INPUT_EVENT_LATENCY_UI_COMPONENT, 0, 0);
       if (renderWidgetHostView_->ShouldRouteEvent(enterEvent)) {
         renderWidgetHostView_->render_widget_host_->delegate()
             ->GetInputEventRouter()
-            ->RouteMouseEvent(renderWidgetHostView_.get(), &enterEvent);
+            ->RouteMouseEvent(renderWidgetHostView_.get(), &enterEvent,
+                              latency_info);
       } else {
-        ui::LatencyInfo latency_info;
-        latency_info.AddLatencyNumber(ui::INPUT_EVENT_LATENCY_UI_COMPONENT,
-                                      0, 0);
         renderWidgetHostView_->ProcessMouseEvent(enterEvent, latency_info);
       }
     }
   }
   mouseEventWasIgnored_ = NO;
 
   // Don't cancel child popups; killing them on a mouse click would prevent the
   // user from positioning the insertion point in the text field spawning the
   // popup. A click outside the text field would cause the text field to drop
   // the focus, and then EditorClientImpl::textFieldDidEndEditing() would cancel
@@ skipping 10 matching lines @@
   // - (NSUInteger)characterIndexForPoint:.
   // See: http://code.google.com/p/chromium/issues/detail?id=47141
   // Instead of sending mouse events to the input method first, we now just
   // simply confirm all ongoing composition here.
   if (type == NSLeftMouseDown || type == NSRightMouseDown ||
       type == NSOtherMouseDown) {
     [self finishComposingText];
   }
 
   WebMouseEvent event = WebMouseEventBuilder::Build(theEvent, self);
+  ui::LatencyInfo latency_info(ui::SourceEventType::OTHER);
+  latency_info.AddLatencyNumber(ui::INPUT_EVENT_LATENCY_UI_COMPONENT, 0, 0);
   if (renderWidgetHostView_->ShouldRouteEvent(event)) {
     renderWidgetHostView_->render_widget_host_->delegate()
         ->GetInputEventRouter()
-        ->RouteMouseEvent(renderWidgetHostView_.get(), &event);
+        ->RouteMouseEvent(renderWidgetHostView_.get(), &event, latency_info);
   } else {
-    ui::LatencyInfo latency_info;
-    latency_info.AddLatencyNumber(ui::INPUT_EVENT_LATENCY_UI_COMPONENT, 0, 0);
     renderWidgetHostView_->ProcessMouseEvent(event, latency_info);
   }
 }
 
 - (BOOL)performKeyEquivalent:(NSEvent*)theEvent {
   // |performKeyEquivalent:| is sent to all views of a window, not only down the
   // responder chain (cf. "Handling Key Equivalents" in
   // http://developer.apple.com/mac/library/documentation/Cocoa/Conceptual/EventOverview/HandlingKeyEvents/HandlingKeyEvents.html
   // ). We only want to handle key equivalents if we're first responder.
   if ([[self window] firstResponder] != self)
@@ skipping 310 matching lines @@
   if ([event phase] != NSEventPhaseEnded &&
       [event phase] != NSEventPhaseCancelled) {
     return;
   }
 
   if (renderWidgetHostView_->render_widget_host_) {
     // History-swiping is not possible if the logic reaches this point.
     WebMouseWheelEvent webEvent = WebMouseWheelEventBuilder::Build(
         event, self);
     webEvent.railsMode = mouseWheelFilter_.UpdateRailsMode(webEvent);
-    ui::LatencyInfo latency_info;
+    ui::LatencyInfo latency_info(ui::SourceEventType::WHEEL);
     latency_info.AddLatencyNumber(ui::INPUT_EVENT_LATENCY_UI_COMPONENT, 0, 0);
     renderWidgetHostView_->render_widget_host_->
         ForwardWheelEventWithLatencyInfo(webEvent, latency_info);
   }
 
   if (endWheelMonitor_) {
     [NSEvent removeMonitor:endWheelMonitor_];
     endWheelMonitor_ = nil;
   }
 }
@@ skipping 178 matching lines @@
       handler:^(NSEvent* blockEvent) {
           [self shortCircuitScrollWheelEvent:blockEvent];
           return blockEvent;
       }];
   }
 
   // This is responsible for content scrolling!
   if (renderWidgetHostView_->render_widget_host_) {
     WebMouseWheelEvent webEvent = WebMouseWheelEventBuilder::Build(event, self);
     webEvent.railsMode = mouseWheelFilter_.UpdateRailsMode(webEvent);
+    ui::LatencyInfo latency_info(ui::SourceEventType::WHEEL);
+    latency_info.AddLatencyNumber(ui::INPUT_EVENT_LATENCY_UI_COMPONENT, 0, 0);
     if (renderWidgetHostView_->ShouldRouteEvent(webEvent)) {
       renderWidgetHostView_->render_widget_host_->delegate()
           ->GetInputEventRouter()
-          ->RouteMouseWheelEvent(renderWidgetHostView_.get(), &webEvent);
+          ->RouteMouseWheelEvent(renderWidgetHostView_.get(), &webEvent,
+                                 latency_info);
     } else {
-      ui::LatencyInfo latency_info;
-      latency_info.AddLatencyNumber(ui::INPUT_EVENT_LATENCY_UI_COMPONENT, 0, 0);
       renderWidgetHostView_->ProcessMouseWheelEvent(webEvent, latency_info);
     }
   }
 }
 
 // Called repeatedly during a pinch gesture, with incremental change values.
 - (void)magnifyWithEvent:(NSEvent*)event {
   if (!renderWidgetHostView_->render_widget_host_)
     return;
 
@@ skipping 895 matching lines @@
 
 // "-webkit-app-region: drag | no-drag" is implemented on Mac by excluding
 // regions that are not draggable. (See ControlRegionView in
 // native_app_window_cocoa.mm). This requires the render host view to be
 // draggable by default.
 - (BOOL)mouseDownCanMoveWindow {
   return YES;
 }
 
 @end