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chrome/browser/renderer_host/render_widget_host.cc

Index: chrome/browser/renderer_host/render_widget_host.cc
diff --git a/chrome/browser/renderer_host/render_widget_host.cc b/chrome/browser/renderer_host/render_widget_host.cc
index da18bd86582d1f681ca00718f76babb285236043..464e3639c325c96cce0a109b71e218e877d61a06 100644
--- a/chrome/browser/renderer_host/render_widget_host.cc
+++ b/chrome/browser/renderer_host/render_widget_host.cc
@@ -331,6 +331,13 @@ void RenderWidgetHost::ForwardMouseEvent(const WebMouseEvent& mouse_event) {
     OnUserGesture();
   }
 
+  if (mouse_event.type == WebInputEvent::MouseUp ||
+      mouse_event.type == WebInputEvent::MouseDown) {
+    // We keep track of these events in case the renderer doesn't handle them.
+    // In that case we can then implement some default behaviour.
+    mouse_button_queue_.push(new WebMouseEvent(mouse_event));
+  }
+
   ForwardInputEvent(mouse_event, sizeof(WebMouseEvent));
 }
 
@@ -669,6 +676,10 @@ void RenderWidgetHost::OnMsgInputEventAck(const IPC::Message& message) {
   bool r = message.ReadInt(&iter, &type);
   DCHECK(r);
 
+  bool processed = false;
+  r = message.ReadBool(&iter, &processed);
+  DCHECK(r);
+
   if (type == WebInputEvent::MouseMove) {
     mouse_move_pending_ = false;
 
@@ -677,9 +688,22 @@ void RenderWidgetHost::OnMsgInputEventAck(const IPC::Message& message) {
       DCHECK(next_mouse_move_->type == WebInputEvent::MouseMove);
       ForwardMouseEvent(*next_mouse_move_);
     }
-  }
+  } else if (type == WebInputEvent::MouseDown ||
+             type == WebInputEvent::MouseUp) {
+    if (mouse_button_queue_.size() == 0 ||
+        mouse_button_queue_.front()->type != type) {
+      LOG(ERROR) << "We got a mouse event from the renderer, but we don't "
+                    "remember sending it!";
+    } else {
+      const MouseButtonQueue::value_type front_item =
+          mouse_button_queue_.front();
+      mouse_button_queue_.pop();
 
-  if (WebInputEvent::isKeyboardEventType(type)) {
+      if (!processed)
+        UnhandledMouseButtonEvent(front_item);
+      delete front_item;
+    }
+  } else if (WebInputEvent::isKeyboardEventType(type)) {
     if (key_queue_.size() == 0) {
       LOG(ERROR) << "Got a KeyEvent back from the renderer but we "
                  << "don't seem to have sent it to the renderer!";
@@ -688,10 +712,6 @@ void RenderWidgetHost::OnMsgInputEventAck(const IPC::Message& message) {
                  << "the renderer. (" << key_queue_.front().type << " vs. "
                  << type << "). Ignoring event.";
     } else {
-      bool processed = false;
-      r = message.ReadBool(&iter, &processed);
-      DCHECK(r);
-
       KeyQueue::value_type front_item = key_queue_.front();
       key_queue_.pop();