Prepare SyntheticPointerAction to handle touch actions for multiple fingers

content/browser/renderer_host/input/synthetic_gesture_controller.cc

Index: content/browser/renderer_host/input/synthetic_gesture_controller.cc
diff --git a/content/browser/renderer_host/input/synthetic_gesture_controller.cc b/content/browser/renderer_host/input/synthetic_gesture_controller.cc
index 9e5bc84403eb18e01f09e43b26b9db51fbd20211..ebcae9b141f17962f3e19e474d869f50f6868a98 100644
--- a/content/browser/renderer_host/input/synthetic_gesture_controller.cc
+++ b/content/browser/renderer_host/input/synthetic_gesture_controller.cc
@@ -12,11 +12,15 @@
 #include "content/common/input_messages.h"
 #include "content/public/browser/render_widget_host.h"
 
+using blink::WebTouchEvent;
+
 namespace content {
 
 SyntheticGestureController::SyntheticGestureController(
     std::unique_ptr<SyntheticGestureTarget> gesture_target)
-    : gesture_target_(std::move(gesture_target)) {}
+    : gesture_target_(std::move(gesture_target)) {
+  index_map_ = std::vector<int>(WebTouchEvent::touchesLengthCap, -1);
+}
 
 SyntheticGestureController::~SyntheticGestureController() {}
 
@@ -34,6 +38,52 @@ void SyntheticGestureController::QueueSyntheticGesture(
     StartGesture(*pending_gesture_queue_.FrontGesture());
 }
 
+void SyntheticGestureController::QueueSyntheticPointerAction(
+    const SyntheticPointerActionParams& gesture_params,
+    const OnGestureCompleteCallback& completion_callback) {
+  DCHECK(gesture_params.pointer_action_type() !=
+         SyntheticPointerActionParams::PointerActionType::NOT_INITIALIZED);
+
+  if (gesture_params.pointer_action_type() ==
+          SyntheticPointerActionParams::PointerActionType::PROCESS ||
+      gesture_params.pointer_action_type() ==
+          SyntheticPointerActionParams::PointerActionType::FINISH) {
+    if (gesture_params.pointer_action_type() ==
+        SyntheticPointerActionParams::PointerActionType::FINISH) {
+      action_param_list_.push_back(gesture_params);
+    }
+
+    // TODO(lanwei): Will support multiple pointer types in the same stream
+    // later.
+    if (!action_param_list_.empty()) {
+      if (!synthetic_pointer_)
+        SetSyntheticPointer(gesture_params);
+
+      std::unique_ptr<SyntheticGesture> synthetic_gesture =
+          std::unique_ptr<SyntheticGesture>(new SyntheticPointerAction(
+              action_param_list_, synthetic_pointer_.get(), &index_map_));
+      QueueSyntheticGesture(std::move(synthetic_gesture), completion_callback);
+      action_param_list_.clear();
+    }
+  } else
+    action_param_list_.push_back(gesture_params);
+}
+
+void SyntheticGestureController::SetSyntheticPointer(
+    const SyntheticPointerActionParams& gesture_params) {
+  SyntheticGestureParams::GestureSourceType gesture_source_type =
+      gesture_params.gesture_source_type;
+  if (gesture_source_type == SyntheticGestureParams::DEFAULT_INPUT)
+    gesture_source_type =
+        gesture_target_->GetDefaultSyntheticGestureSourceType();
+  DCHECK_NE(gesture_source_type, SyntheticGestureParams::DEFAULT_INPUT);
+  synthetic_pointer_ = SyntheticPointer::Create(gesture_source_type);
+}
+
+void SyntheticGestureController::ResetSyntheticPointer() {
+  synthetic_pointer_.reset();
+}
+
 void SyntheticGestureController::Flush(base::TimeTicks timestamp) {
   TRACE_EVENT0("input", "SyntheticGestureController::Flush");
   if (pending_gesture_queue_.IsEmpty())
@@ -93,6 +143,12 @@ void SyntheticGestureController::StopGesture(
   completion_callback.Run(result);
 }
 
+int SyntheticGestureController::PointerIndex(int index) const {
+  CHECK_GE(index, 0);
+  CHECK_LT(index, WebTouchEvent::touchesLengthCap);
+  return index_map_[index];
+}
+
 SyntheticGestureController::GestureAndCallbackQueue::GestureAndCallbackQueue() {
 }