Adding proper dragging behavior for L/R maximized windows.

ash/wm/workspace/workspace_window_resizer_unittest.cc

Index: ash/wm/workspace/workspace_window_resizer_unittest.cc
diff --git a/ash/wm/workspace/workspace_window_resizer_unittest.cc b/ash/wm/workspace/workspace_window_resizer_unittest.cc
index c831d12e11bbb38e4e9a8d5f75a4d2f5cf4098e0..ea631fbb4e1ac87d458536f94e6ab4f7afd61a4b 100644
--- a/ash/wm/workspace/workspace_window_resizer_unittest.cc
+++ b/ash/wm/workspace/workspace_window_resizer_unittest.cc
@@ -904,5 +904,22 @@ TEST_F(WorkspaceWindowResizerTest, CtrlCompleteDragMoveToExactPosition) {
   EXPECT_EQ("106,124 320x160", window_->bounds().ToString());
 }
 
+// Verifies that a dragged window will restore to its pre-maximized size.
+TEST_F(WorkspaceWindowResizerTest, RestoreToPreMaximizeCoordinates) {

[sky, 2012/09/07 02:43:30]

Add coverage of the revert case

[Mr4D (OOO till 08-26), 2012/09/08 01:17:41]

Done.

+  window_->SetBounds(gfx::Rect(0, 0, 1000, 1000));
+  SetRestoreBoundsInScreen(window_.get(), gfx::Rect(96, 112, 320, 160));
+  scoped_ptr<WorkspaceWindowResizer> resizer(WorkspaceWindowResizer::Create(
+      window_.get(), gfx::Point(), HTCAPTION, empty_windows()));
+  SetGridSize(1);
+  ASSERT_TRUE(resizer.get());
+  // Drag the window to new poistion by adding (180, 12) to original point,
+  // the window should get restored and centered around cursor.
+  resizer->Drag(CalculateDragPoint(*resizer, 180, 12), 0);
+  resizer->CompleteDrag(0);
+  EXPECT_EQ("20,16 320x160", window_->bounds().ToString());
+  // The restore rectangle should get cleared as well.
+  EXPECT_EQ(NULL, GetRestoreBoundsInScreen(window_.get()));
+}
+
 }  // namespace internal
 }  // namespace ash