ozone: Use PlatformEventSource for dispatching events.

Notable changes:
 * Convert EventFactoryOzone into a PlatformEventSource.
 * Convert WindowTreeHostOzone into a PlatformEventDispatcher.
 * The WindowTreeHostOzone looks at the location of the event for mouse, scroll
   and touch-events to decide whether it should dispatch the event or not. It
   expects the event-location it receives to be in the same coordinate space as
   its bounds.
 * Adds an ObserverList in MessagePumpOzone, and the EventFactoryOzone reaches
   into the message-pump to trigger these observers. This is a short-term
   workaround (the same is done for X11 in http://crrev.com/219743002/), until
   the message-pump observers are converted into PlatformEventObservers.
 * Have EventConverterEvdev take in a callback that can be used for dispatching
   events it receives. The EventFactoryEvdev sets this callback to each of these
   converters after creation.
 * Change the asynchronous event-dispatch to be synchronous.

This set of changes allows dispatching events to multiple window-tree hosts (at
least in theory).

BUG=319986
R=rjkroege@chromium.org, spang@chromium.org

Review URL: https://codereview.chromium.org/223363003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@261953 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 6 insertions, 5 deletions

diff --git a/ui/aura/window_tree_host_ozone.h b/ui/aura/window_tree_host_ozone.h
index dadae63c..0e1f469 100644
--- a/ui/aura/window_tree_host_ozone.h
+++ b/ui/aura/window_tree_host_ozone.h
@@ -8,9 +8,9 @@
 #include <vector>
 
 #include "base/memory/scoped_ptr.h"
-#include "base/message_loop/message_pump_dispatcher.h"
 #include "ui/aura/window_tree_host.h"
 #include "ui/events/event_source.h"
+#include "ui/events/platform/platform_event_dispatcher.h"
 #include "ui/gfx/insets.h"
 #include "ui/gfx/rect.h"
 
@@ -18,16 +18,17 @@ namespace aura {
 
 class WindowTreeHostOzone : public WindowTreeHost,
                             public ui::EventSource,
-                            public base::MessagePumpDispatcher {
+                            public ui::PlatformEventDispatcher {
  public:
   explicit WindowTreeHostOzone(const gfx::Rect& bounds);
   virtual ~WindowTreeHostOzone();
 
  private:
-  // Overridden from Dispatcher overrides:
-  virtual uint32_t Dispatch(const base::NativeEvent& event) OVERRIDE;
+  // ui::PlatformEventDispatcher:
+  virtual bool CanDispatchEvent(const ui::PlatformEvent& event) OVERRIDE;
+  virtual uint32_t DispatchEvent(const ui::PlatformEvent& event) OVERRIDE;
 
-  // WindowTreeHost Overrides.
+  // WindowTreeHost:
   virtual gfx::AcceleratedWidget GetAcceleratedWidget() OVERRIDE;
   virtual void Show() OVERRIDE;
   virtual void Hide() OVERRIDE;