Delay Input.dispatchKeyEvent response until after key event ack.

content/browser/devtools/protocol/input_handler.cc

 // 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.
 
 #include "content/browser/devtools/protocol/input_handler.h"
 
 #include <stddef.h>
 
 #include "base/strings/stringprintf.h"
 #include "base/strings/utf_string_conversions.h"
@@ skipping 112 matching lines @@
   } else {
     return false;
   }
   return true;
 }
 
 }  // namespace
 
 InputHandler::InputHandler()
     : host_(NULL),
+      input_queued_(false),
       page_scale_factor_(1.0),
       weak_factory_(this) {
 }
 
 InputHandler::~InputHandler() {
 }
 
+void InputHandler::OnInputEvent(const blink::WebInputEvent& event) {
+  input_queued_ = true;
+}
+
+void InputHandler::OnInputEventAck(const blink::WebInputEvent& event) {
+  if (blink::WebInputEvent::isKeyboardEventType(event.type) &&
+      !pending_key_command_ids_.empty()) {
+    SendDispatchKeyEventResponse(pending_key_command_ids_.front());
+    pending_key_command_ids_.pop_front();
+  } else if (blink::WebInputEvent::isMouseEventType(event.type) &&
+             !pending_mouse_command_ids_.empty()) {
+    SendDispatchMouseEventResponse(pending_mouse_command_ids_.front());
+    pending_mouse_command_ids_.pop_front();
+  }
+}
+
 void InputHandler::SetRenderWidgetHost(RenderWidgetHostImpl* host) {
+  for (const DevToolsCommandId& command_id : pending_key_command_ids_)

[dgozman, 2016/11/21 19:14:39]

You'll need to do the same on detach. See Detached() method in other domain
handlers.

[samuong, 2016/11/21 22:28:43]

I've added an InputHandler::Detached method, but there's no superclass Detached
method that I'm overriding, so I'm not really clear on how this gets called.
Does the call come from generated code somewhere?

[samuong, 2016/11/23 00:37:47]

Done - added a call from RFDTAH::OnClientDetached

+    SendDispatchKeyEventResponse(command_id);
+  pending_key_command_ids_.clear();
+
+  for (const DevToolsCommandId& command_id : pending_mouse_command_ids_)
+    SendDispatchMouseEventResponse(command_id);
+  pending_mouse_command_ids_.clear();
+
+  if (host_)
+    host_->RemoveInputEventObserver(this);
   host_ = host;
+  if (host)
+    host->AddInputEventObserver(this);
 }
 
 void InputHandler::SetClient(std::unique_ptr<Client> client) {
   client_.swap(client);
 }
 
 void InputHandler::OnSwapCompositorFrame(
     const cc::CompositorFrameMetadata& frame_metadata) {
   page_scale_factor_ = frame_metadata.page_scale_factor;
   scrollable_viewport_size_ = frame_metadata.scrollable_viewport_size;
 }
 
 Response InputHandler::DispatchKeyEvent(
+    DevToolsCommandId command_id,
     const std::string& type,
     const int* modifiers,
     const double* timestamp,
     const std::string* text,
     const std::string* unmodified_text,
     const std::string* key_identifier,
     const std::string* code,
     const std::string* key,
     const int* windows_virtual_key_code,
     const int* native_virtual_key_code,
@@ skipping 41 matching lines @@
 
   if (key) {
     event.domKey = static_cast<int>(
         ui::KeycodeConverter::KeyStringToDomKey(*key));
   }
 
   if (!host_)
     return Response::ServerError("Could not connect to view");
 
   host_->Focus();
+  input_queued_ = false;
   host_->ForwardKeyboardEvent(event);
+  if (input_queued_)
+    pending_key_command_ids_.push_back(command_id);
+  else
+    SendDispatchKeyEventResponse(command_id);
   return Response::OK();
 }
 
 Response InputHandler::DispatchMouseEvent(
+    DevToolsCommandId command_id,
     const std::string& type,
     int x,
     int y,
     const int* modifiers,
     const double* timestamp,
     const std::string* button,
     const int* click_count) {
   blink::WebMouseEvent event;
 
   if (!SetMouseEventType(&event, type)) {
@@ skipping 11 matching lines @@
   event.windowY = y * page_scale_factor_;
   event.globalX = x * page_scale_factor_;
   event.globalY = y * page_scale_factor_;
   event.clickCount = click_count ? *click_count : 0;
   event.pointerType = blink::WebPointerProperties::PointerType::Mouse;
 
   if (!host_)
     return Response::ServerError("Could not connect to view");
 
   host_->Focus();
+  input_queued_ = false;
   host_->ForwardMouseEvent(event);
+  if (input_queued_)
+    pending_mouse_command_ids_.push_back(command_id);
+  else
+    SendDispatchMouseEventResponse(command_id);
   return Response::OK();
 }
 
 Response InputHandler::EmulateTouchFromMouseEvent(const std::string& type,
                                                   int x,
                                                   int y,
                                                   double timestamp,
                                                   const std::string& button,
                                                   double* delta_x,
                                                   double* delta_y,
@@ skipping 209 matching lines @@
 }
 
 Response InputHandler::DispatchTouchEvent(
     const std::string& type,
     const std::vector<std::unique_ptr<base::DictionaryValue>>& touch_points,
     const int* modifiers,
     const double* timestamp) {
   return Response::FallThrough();
 }
 
+void InputHandler::SendDispatchKeyEventResponse(DevToolsCommandId command_id) {
+  client_->SendDispatchKeyEventResponse(
+      command_id, DispatchKeyEventResponse::Create());
+}
+
+void InputHandler::SendDispatchMouseEventResponse(
+    DevToolsCommandId command_id) {
+  client_->SendDispatchMouseEventResponse(
+      command_id, DispatchMouseEventResponse::Create());
+}
+
 void InputHandler::SendSynthesizePinchGestureResponse(
     DevToolsCommandId command_id,
     SyntheticGesture::Result result) {
   if (result == SyntheticGesture::Result::GESTURE_FINISHED) {
     client_->SendSynthesizePinchGestureResponse(
         command_id, SynthesizePinchGestureResponse::Create());
   } else {
     client_->SendError(command_id,
                        Response::InternalError(base::StringPrintf(
                            "Synthetic pinch failed, result was %d", result)));
@@ skipping 25 matching lines @@
   } else {
     client_->SendError(command_id,
                        Response::InternalError(base::StringPrintf(
                            "Synthetic tap failed, result was %d", result)));
   }
 }
 
 }  // namespace input
 }  // namespace devtools
 }  // namespace content