[DevTools] Touch emulation in content.

content/browser/renderer_host/render_widget_host_impl.cc

Index: content/browser/renderer_host/render_widget_host_impl.cc
diff --git a/content/browser/renderer_host/render_widget_host_impl.cc b/content/browser/renderer_host/render_widget_host_impl.cc
index c7e66dbc734ee6841e75e803f40108a0ac356772..971a2de6ac14f13dcb227972e3ed23dcad1e030e 100644
--- a/content/browser/renderer_host/render_widget_host_impl.cc
+++ b/content/browser/renderer_host/render_widget_host_impl.cc
@@ -38,6 +38,7 @@
 #include "content/browser/renderer_host/input/synthetic_gesture_controller.h"
 #include "content/browser/renderer_host/input/synthetic_gesture_target.h"
 #include "content/browser/renderer_host/input/timeout_monitor.h"
+#include "content/browser/renderer_host/input/touch_emulator.h"
 #include "content/browser/renderer_host/overscroll_controller.h"
 #include "content/browser/renderer_host/render_process_host_impl.h"
 #include "content/browser/renderer_host/render_view_host_impl.h"
@@ -243,6 +244,8 @@ RenderWidgetHostImpl::RenderWidgetHostImpl(RenderWidgetHostDelegate* delegate,
 
   input_router_.reset(new InputRouterImpl(process_, this, this, routing_id_));
 
+  touch_emulator_.reset();
+
 #if defined(USE_AURA)
   bool overscroll_enabled = CommandLine::ForCurrentProcess()->
       GetSwitchValueASCII(switches::kOverscrollHistoryNavigation) != "0";
@@ -483,6 +486,8 @@ bool RenderWidgetHostImpl::OnMessageReceived(const IPC::Message &msg) {
     IPC_MESSAGE_HANDLER(ViewHostMsg_Focus, OnFocus)
     IPC_MESSAGE_HANDLER(ViewHostMsg_Blur, OnBlur)
     IPC_MESSAGE_HANDLER(ViewHostMsg_SetCursor, OnSetCursor)
+    IPC_MESSAGE_HANDLER(ViewHostMsg_SetTouchEventEmulationEnabled,
+                        OnSetTouchEventEmulationEnabled)
     IPC_MESSAGE_HANDLER(ViewHostMsg_TextInputTypeChanged,
                         OnTextInputTypeChanged)
     IPC_MESSAGE_HANDLER(ViewHostMsg_ImeCancelComposition,
@@ -681,10 +686,16 @@ void RenderWidgetHostImpl::Blur() {
   if (overscroll_controller_)
     overscroll_controller_->Cancel();
 
+  if (touch_emulator_)
+    touch_emulator_->CancelTouch();
+
   Send(new InputMsg_SetFocus(routing_id_, false));
 }
 
 void RenderWidgetHostImpl::LostCapture() {
+  if (touch_emulator_)
+    touch_emulator_->CancelTouch();
+
   Send(new InputMsg_MouseCaptureLost(routing_id_));
 }
 
@@ -998,6 +1009,9 @@ void RenderWidgetHostImpl::ForwardMouseEventWithLatencyInfo(
   if (IgnoreInputEvents())
     return;
 
+  if (touch_emulator_ && touch_emulator_->HandleMouseEvent(mouse_event))
+    return;
+
   input_router_->SendMouseEvent(MouseEventWithLatencyInfo(mouse_event,
                                                           latency_info));
 }
@@ -1021,6 +1035,9 @@ void RenderWidgetHostImpl::ForwardWheelEventWithLatencyInfo(
   if (IgnoreInputEvents())
     return;
 
+  if (touch_emulator_ && touch_emulator_->HandleMouseWheelEvent(wheel_event))
+    return;
+
   input_router_->SendWheelEvent(MouseWheelEventWithLatencyInfo(wheel_event,
                                                                latency_info));
 }
@@ -1070,6 +1087,11 @@ void RenderWidgetHostImpl::ForwardGestureEventWithLatencyInfo(
   input_router_->SendGestureEvent(gesture_with_latency);
 }
 
+void RenderWidgetHostImpl::ForwardTouchEvent(
+      const blink::WebTouchEvent& touch_event) {
+  ForwardTouchEventWithLatencyInfo(touch_event, ui::LatencyInfo());
+}
+
 void RenderWidgetHostImpl::ForwardTouchEventWithLatencyInfo(
       const blink::WebTouchEvent& touch_event,
       const ui::LatencyInfo& ui_latency) {
@@ -1145,6 +1167,9 @@ void RenderWidgetHostImpl::ForwardKeyboardEvent(
       suppress_next_char_events_ = false;
   }
 
+  if (touch_emulator_ && touch_emulator_->HandleKeyboardEvent(key_event))
+    return;
+
   input_router_->SendKeyboardEvent(
       key_event,
       CreateRWHLatencyInfoIfNotExist(NULL, key_event.type),
@@ -1165,6 +1190,12 @@ void RenderWidgetHostImpl::QueueSyntheticGesture(
   }
 }
 
+void RenderWidgetHostImpl::SetCursor(const WebCursor& cursor) {
+  if (!view_)
+    return;
+  view_->UpdateCursor(cursor);
+}
+
 void RenderWidgetHostImpl::SendCursorVisibilityState(bool is_visible) {
   Send(new InputMsg_CursorVisibilityChange(GetRoutingID(), is_visible));
 }
@@ -1829,10 +1860,19 @@ void RenderWidgetHostImpl::OnBlur() {
 }
 
 void RenderWidgetHostImpl::OnSetCursor(const WebCursor& cursor) {
-  if (!view_) {
-    return;
+  SetCursor(cursor);
+}
+
+void RenderWidgetHostImpl::OnSetTouchEventEmulationEnabled(
+    bool enabled, bool allow_pinch) {
+  if (enabled) {
+    if (!touch_emulator_)
+      touch_emulator_.reset(new TouchEmulator(this));
+    touch_emulator_->Enable(allow_pinch);
+  } else {
+    if (touch_emulator_)
+      touch_emulator_->Disable();
   }
-  view_->UpdateCursor(cursor);
 }
 
 void RenderWidgetHostImpl::OnTextInputTypeChanged(
@@ -2170,6 +2210,10 @@ void RenderWidgetHostImpl::OnTouchEventAck(
         ui::INPUT_EVENT_LATENCY_TERMINATED_TOUCH_COMPONENT, 0, 0);
   }
   ComputeTouchLatency(touch_event.latency);
+
+  if (touch_emulator_ && touch_emulator_->HandleTouchEventAck(ack_result))
+    return;
+
   if (view_)
     view_->ProcessAckedTouchEvent(touch_event, ack_result);
 }