[DevTools] Send ack early when paused in mouse move to keep events coming.

content/renderer/devtools/devtools_agent.cc

Index: content/renderer/devtools/devtools_agent.cc
diff --git a/content/renderer/devtools/devtools_agent.cc b/content/renderer/devtools/devtools_agent.cc
index a2cd36c1044ccd974acac688051b20b46d5220c4..10d591b3a51e6bee0aeaa3df4a423dbad006f820 100644
--- a/content/renderer/devtools/devtools_agent.cc
+++ b/content/renderer/devtools/devtools_agent.cc
@@ -77,7 +77,8 @@ DevToolsAgent::DevToolsAgent(RenderViewImpl* render_view)
     : RenderViewObserver(render_view),
       is_attached_(false),
       is_devtools_client_(false),
-      gpu_route_id_(MSG_ROUTING_NONE) {
+      gpu_route_id_(MSG_ROUTING_NONE),
+      paused_in_mouse_move_(false) {
   g_agent_for_routing_id.Get()[routing_id()] = this;
 
   render_view->webview()->setDevToolsAgentClient(this);
@@ -134,6 +135,19 @@ blink::WebDevToolsAgentClient::WebKitClientMessageLoop*
   return new WebKitClientMessageLoopImpl();
 }
 
+void DevToolsAgent::willEnterModalLoop() {
+  RenderViewImpl* impl = static_cast<RenderViewImpl*>(render_view());
+  paused_in_mouse_move_ = impl->SendAckForCurrentMouseMove();
+}
+
+void DevToolsAgent::didExitModalLoop() {
+  RenderViewImpl* impl = static_cast<RenderViewImpl*>(render_view());
+  if (paused_in_mouse_move_) {
+    impl->IgnoreAckForCurrentMouseMove();
+    paused_in_mouse_move_ = false;
+  }
+}
+
 void DevToolsAgent::resetTraceEventCallback()
 {
   TraceLog::GetInstance()->SetEventCallbackDisabled();