Proper MouseEvent targeting. Adds a Window method that locates a Window for a given point.

aura/aura.gyp

Index: aura/aura.gyp
===================================================================
--- aura/aura.gyp	(revision 98650)
+++ aura/aura.gyp	(working copy)
@@ -29,6 +29,8 @@
         'event.cc',
         'event.h',
         'event_win.cc',
+        'root_window.cc',
+        'root_window.h',
         'window.cc',
         'window.h',
         'window_delegate.h',
@@ -58,5 +60,29 @@
         '<(SHARED_INTERMEDIATE_DIR)/ui/ui_resources/ui_resources.rc',
       ],
     },
+    {
+      'target_name': 'aura_unittests',
+      'type': 'executable',
+      'dependencies': [
+        '<(DEPTH)/base/base.gyp:test_support_base',
+        '<(DEPTH)/skia/skia.gyp:skia',
+        '<(DEPTH)/testing/gtest.gyp:gtest',
+        '<(DEPTH)/ui/ui.gyp:gfx_resources',
+        '<(DEPTH)/ui/ui.gyp:ui',
+        '<(DEPTH)/ui/ui.gyp:ui_resources',
+        'aura',
+      ],
+      'include_dirs': [
+        '..',
+      ],
+      'sources': [
+        'window_unittest.cc',
+        'run_all_unittests.cc',
+        'test_suite.cc',
+        'test_suite.h',
+        '<(SHARED_INTERMEDIATE_DIR)/ui/gfx/gfx_resources.rc',
+        '<(SHARED_INTERMEDIATE_DIR)/ui/ui_resources/ui_resources.rc',
+      ],
+    },
   ],
 }