Prepare SyntheticPointerAction to handle touch actions for multiple fingers

content/browser/renderer_host/render_widget_host_impl.h

Index: content/browser/renderer_host/render_widget_host_impl.h
diff --git a/content/browser/renderer_host/render_widget_host_impl.h b/content/browser/renderer_host/render_widget_host_impl.h
index 2d6a4d88d3254a9b9cf1d9eaa11a2a72f43091e2..9830f4c385230b39acf19cbfffbf54d1b4b69fce 100644
--- a/content/browser/renderer_host/render_widget_host_impl.h
+++ b/content/browser/renderer_host/render_widget_host_impl.h
@@ -30,6 +30,7 @@
 #include "content/browser/renderer_host/input/input_router_client.h"
 #include "content/browser/renderer_host/input/render_widget_host_latency_tracker.h"
 #include "content/browser/renderer_host/input/synthetic_gesture.h"
+#include "content/browser/renderer_host/input/synthetic_pointer_action.h"
 #include "content/browser/renderer_host/input/touch_emulator_client.h"
 #include "content/browser/renderer_host/render_widget_host_view_base.h"
 #include "content/common/input/input_event_ack_state.h"
@@ -87,6 +88,8 @@ class WebCursor;
 struct EditCommand;
 struct ResizeParams;
 
+using blink::WebTouchEvent;
+
 // This implements the RenderWidgetHost interface that is exposed to
 // embedders of content, and adds things only visible to content.
 class CONTENT_EXPORT RenderWidgetHostImpl : public RenderWidgetHost,
@@ -602,6 +605,11 @@ class CONTENT_EXPORT RenderWidgetHostImpl : public RenderWidgetHost,
   // widgets that don't have focus to still handle key presses.
   bool KeyPressListenersHandleEvent(const NativeWebKeyboardEvent& event);
 
+  void QueueSyntheticPointerAction(
+      const SyntheticPointerActionParams& gesture_params);
+
+  void SetSyntheticPointer(const SyntheticPointerActionParams& gesture_params);
+
   // InputRouterClient
   InputEventAckState FilterInputEvent(
       const blink::WebInputEvent& event,
@@ -628,6 +636,8 @@ class CONTENT_EXPORT RenderWidgetHostImpl : public RenderWidgetHost,
 
   void OnSyntheticGestureCompleted(SyntheticGesture::Result result);
 
+  void OnSyntheticPointerActionCompleted(SyntheticGesture::Result result);

[tdresser, 2016/04/18 15:24:39]

It isn't clear to me why we need this in addition to
OnSyntheticGestureCompleted. Aren't SyntheticPointerActions SyntheticGestures?

[lanwei, 2016/04/19 19:05:32]

Yes, but OnSyntheticGestureCompleted will send something back, but for our
SyntheticPointerAction, it is not necessary to send thing back every time when
we queue a SyntheticGesture. I am sending a message back when we finish
processing all the actions. 

+
   // Called when there is a new auto resize (using a post to avoid a stack
   // which may get in recursive loops).
   void DelayedAutoResized();
@@ -821,6 +831,12 @@ class CONTENT_EXPORT RenderWidgetHostImpl : public RenderWidgetHost,
   // renderer process before clearing any previously displayed content.
   base::TimeDelta new_content_rendering_delay_;
 
+  std::vector<SyntheticPointerActionParams> action_param_list_;
+
+  std::unique_ptr<SyntheticPointer> synthetic_pointer_;
+
+  int index_map_[blink::WebTouchEvent::touchesLengthCap];
+
   base::WeakPtrFactory<RenderWidgetHostImpl> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(RenderWidgetHostImpl);