Declare native types for Android.

ui/gfx/native_widget_types.h

Index: ui/gfx/native_widget_types.h
diff --git a/ui/gfx/native_widget_types.h b/ui/gfx/native_widget_types.h
index e6421a1d652faa2699e63caab63ddba0e71ef203..9eeb0804a8856f623316aea702f8c4aa016dacfd 100644
--- a/ui/gfx/native_widget_types.h
+++ b/ui/gfx/native_widget_types.h
@@ -80,6 +80,8 @@ typedef struct _GdkRegion GdkRegion;
 typedef struct _GtkWidget GtkWidget;
 typedef struct _GtkWindow GtkWindow;
 typedef struct _cairo cairo_t;
+#elif defined(OS_ANDROID)
+class ChromeView;
 #endif
 class SkBitmap;
 
@@ -135,6 +137,15 @@ typedef GdkCursor* NativeCursor;
 typedef GtkWidget* NativeMenu;
 typedef GdkRegion* NativeRegion;
 typedef void* NativeViewAccessible;
+#elif defined(OS_ANDROID)
+typedef void* NativeFont;
+typedef ChromeView* NativeView;
+typedef ChromeView* NativeWindow;
+typedef void* NativeEditView;
+typedef void* NativeDrawingContext;
+typedef void* NativeCursor;
+typedef void* NativeMenu;
+typedef void* NativeViewAccessible;
 #endif
 
 #if defined(OS_MACOSX)