Consolidate/cleanup event cracking code; single out GdkEvents.

ui/base/events.h

Index: ui/base/events.h
diff --git a/ui/base/events.h b/ui/base/events.h
index 03e67d05fe6242ef38e17a9e7cb47788f009486e..b0f3824efe4c6502c312f60f45ae86118a96cbfc 100644
--- a/ui/base/events.h
+++ b/ui/base/events.h
@@ -6,8 +6,34 @@
 #define UI_BASE_EVENTS_H_
 #pragma once
 
+#include "ui/base/keycodes/keyboard_codes.h"
+#include "ui/gfx/native_widget_types.h"
+
+namespace gfx {
+class Point;
+}
+
+#if defined(USE_X11)
+typedef union _XEvent XEvent;
+#endif
+#if defined(USE_WAYLAND)
+namespace ui {
+union WaylandEvent;
+}
+#endif
+
 namespace ui {
 
+#if defined(OS_WIN)
+typedef MSG NativeEvent;
+#elif defined(USE_WAYLAND)
+typedef ui::WaylandEvent* NativeEvent;
+#elif defined(USE_X11)
+typedef XEvent* NativeEvent;
+#else
+typedef void* NativeEvent;
+#endif
+
 // Event types. (prefixed because of a conflict with windows headers)
 enum EventType {
   ET_UNKNOWN = 0,
@@ -42,6 +68,7 @@ enum EventFlags {
   EF_MIDDLE_BUTTON_DOWN = 1 << 5,
   EF_RIGHT_BUTTON_DOWN  = 1 << 6,
   EF_COMMAND_DOWN       = 1 << 7,  // Only useful on OSX
+  EF_EXTENDED           = 1 << 8,  // Windows extended key (see WM_KEYDOWN doc)
 };
 
 // Flags specific to mouse events
@@ -64,7 +91,24 @@ enum TouchStatus {
                              // unused touch event was handled.
 };
 
+// Get the EventType from a native event.
+UI_EXPORT EventType EventTypeFromNative(const NativeEvent& native_event);
+
+// Get the EventFlags from a native event.
+UI_EXPORT int EventFlagsFromNative(const NativeEvent& native_event);
+
+// Get the location from a native event.
+UI_EXPORT gfx::Point EventLocationFromNative(const NativeEvent& native_event);
+
+// Returns the KeyboardCode from a native event.
+UI_EXPORT KeyboardCode KeyboardCodeFromNative(const NativeEvent& native_event);
+
+// Returns true if the message is a mouse event.
+UI_EXPORT bool IsMouseEvent(const NativeEvent& native_event);
+
+// Get the mouse wheel offset from a native event.
+UI_EXPORT int GetMouseWheelOffset(const NativeEvent& native_event);
+
 }  // namespace ui
 
 #endif  // UI_BASE_EVENTS_H_
-