Add unittests for null/empty window shapes

chrome/browser/ui/views/apps/shaped_app_window_targeter_unittest.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/ui/views/apps/shaped_app_window_targeter.h"
 
 #include "apps/ui/views/app_window_frame_view.h"
 #include "chrome/browser/ui/views/apps/chrome_native_app_window_views.h"
 #include "ui/aura/test/aura_test_base.h"
 #include "ui/aura/window.h"
@@ skipping 54 matching lines @@
     ui::MouseEvent move(ui::ET_MOUSE_MOVED,
                         gfx::Point(40, 40), gfx::Point(40, 40),
                         ui::EF_NONE, ui::EF_NONE);
     ui::EventDispatchDetails details =
         event_processor()->OnEventFromSource(&move);
     ASSERT_FALSE(details.dispatcher_destroyed);
     EXPECT_EQ(window, move.target());
   }
 
   scoped_ptr<SkRegion> region(new SkRegion);
+  region->op(SkIRect::MakeXYWH(0, 0, 0, 0), SkRegion::kUnion_Op);
+  app_window()->UpdateShape(region.Pass());
+  {
+    // With an empty custom shape, all events within the window should fall
+    // through to the root window.
+    ui::MouseEvent move(ui::ET_MOUSE_MOVED,
+                        gfx::Point(40, 40), gfx::Point(40, 40),
+                        ui::EF_NONE, ui::EF_NONE);
+    ui::EventDispatchDetails details =
+        event_processor()->OnEventFromSource(&move);
+    ASSERT_FALSE(details.dispatcher_destroyed);
+    EXPECT_EQ(root_window(), move.target());
+  }
+
+  // Window shape (global coordinates)
+  //    30       70    90        130
+  //  30 +        +-----+
+  //       .      |     |             <- mouse move (40,40)
+  //  70 +--------+     +---------+
+  //     |           .            |   <- mouse move (80,80)
+  //  90 +--------+     +---------+
+  //              |     |
+  // 130          +-----+
+  region.reset(new SkRegion);
   region->op(SkIRect::MakeXYWH(40, 0, 20, 100), SkRegion::kUnion_Op);
   region->op(SkIRect::MakeXYWH(0, 40, 100, 20), SkRegion::kUnion_Op);
   app_window()->UpdateShape(region.Pass());
   {
     // With the custom shape, the events that don't fall within the custom shape
     // will go through to the root window.
     ui::MouseEvent move(ui::ET_MOUSE_MOVED,
                         gfx::Point(40, 40), gfx::Point(40, 40),
                         ui::EF_NONE, ui::EF_NONE);
     ui::EventDispatchDetails details =
@@ skipping 137 matching lines @@
     ui::MouseEvent move(ui::ET_MOUSE_MOVED,
                         gfx::Point(32, 37), gfx::Point(32, 37),
                         ui::EF_NONE, ui::EF_NONE);
     ui::EventDispatchDetails details =
         event_processor()->OnEventFromSource(&move);
     ASSERT_FALSE(details.dispatcher_destroyed);
     EXPECT_EQ(window, move.target());
   }
 #endif  // defined (OS_CHROMEOS)
 }