Ignore (fake) mouse events that are created during a touch (iff we will handle the touch elsewhere.)

content/browser/renderer_host/render_widget_host_view_win.cc

Index: content/browser/renderer_host/render_widget_host_view_win.cc
diff --git a/content/browser/renderer_host/render_widget_host_view_win.cc b/content/browser/renderer_host/render_widget_host_view_win.cc
index 77f45164a303db0d0f8e05e2c14d65f92c559236..a4c049ffb74690fe3be9c5456f2c8f8a2127a1dc 100644
--- a/content/browser/renderer_host/render_widget_host_view_win.cc
+++ b/content/browser/renderer_host/render_widget_host_view_win.cc
@@ -64,6 +64,9 @@
 #include "webkit/plugins/npapi/webplugin.h"
 #include "webkit/plugins/npapi/webplugin_delegate_impl.h"
 
+// From MSDN.
+#define MOUSEEVENTF_FROMTOUCH 0xFF515700
+
 using base::TimeDelta;
 using base::TimeTicks;
 using content::BrowserThread;
@@ -1796,6 +1799,15 @@ LRESULT RenderWidgetHostViewWin::OnMouseEvent(UINT message, WPARAM wparam,
                                               LPARAM lparam, BOOL& handled) {
   handled = TRUE;
 
+  // Windows sends (fake) mouse messages for touch events.  Ignore these since
+  // we're processing WM_TOUCH elsewhere.
+  if (touch_events_enabled_ &&
+      (message == WM_LBUTTONDOWN || message == WM_LBUTTONUP ||
+       message == WM_RBUTTONDOWN || message == WM_RBUTTONUP) &&
+      (GetMessageExtraInfo() & MOUSEEVENTF_FROMTOUCH) ==
+      MOUSEEVENTF_FROMTOUCH)
+    return 0;
+
   if (message == WM_MOUSELEAVE)
     ignore_mouse_movement_ = true;