aura: Add touch-event support for RWHVA.

content/browser/renderer_host/render_widget_host_view_aura.h

Index: content/browser/renderer_host/render_widget_host_view_aura.h
diff --git a/content/browser/renderer_host/render_widget_host_view_aura.h b/content/browser/renderer_host/render_widget_host_view_aura.h
index cdfd2b014f05aa96e0034d61d1e2bab38fde116b..5c430c87357645047970c80c0ad0986801e84f3e 100644
--- a/content/browser/renderer_host/render_widget_host_view_aura.h
+++ b/content/browser/renderer_host/render_widget_host_view_aura.h
@@ -13,6 +13,10 @@
 #include "ui/gfx/compositor/compositor_observer.h"
 #include "webkit/glue/webcursor.h"
 
+namespace WebKit {
+class WebTouchEvent;
+}
+
 #if defined(UI_COMPOSITOR_IMAGE_TRANSPORT)
 class AcceleratedSurfaceContainerLinux;
 #endif
@@ -134,6 +138,11 @@ class RenderWidgetHostViewAura : public RenderWidgetHostView,
   // The cursor for the page. This is passed up from the renderer.
   WebCursor current_cursor_;
 
+  // The touch-event. Its touch-points are updated as necessary. A new
+  // touch-point is added from an ET_TOUCH_PRESSED event, and a touch-point is
+  // removed from the list on an ET_TOUCH_RELEASED event.
+  WebKit::WebTouchEvent touch_event_;
+
 #if defined(UI_COMPOSITOR_IMAGE_TRANSPORT)
   std::vector< base::Callback<void(void)> > on_compositing_ended_callbacks_;