Don't use drag to corner resizing for unresizable 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 7de57dd0bdec64a505264dfe5ef14c3dd4c871fd..47b3c08f282a2bcf830b20a530e83102a4f5b014 100644
--- a/ash/wm/workspace/workspace_window_resizer_unittest.cc
+++ b/ash/wm/workspace/workspace_window_resizer_unittest.cc
@@ -21,6 +21,7 @@
 #include "ash/wm/workspace/phantom_window_controller.h"
 #include "base/string_number_conversions.h"
 #include "base/stringprintf.h"
+#include "ui/aura/client/aura_constants.h"
 #include "ui/aura/root_window.h"
 #include "ui/aura/test/test_window_delegate.h"
 #include "ui/base/hit_test.h"
@@ -517,6 +518,19 @@ TEST_F(WorkspaceWindowResizerTest, Edge) {
 #endif
 }
 
+// Check that non resizable windows will not get resized.
+TEST_F(WorkspaceWindowResizerTest, NonResizableWindows) {
+  window_->SetBounds(gfx::Rect(20, 30, 50, 60));
+  window_->SetProperty(aura::client::kCanResizeKey, false);
+
+  scoped_ptr<WorkspaceWindowResizer> resizer(WorkspaceWindowResizer::Create(
+      window_.get(), gfx::Point(), HTCAPTION, empty_windows()));
+  ASSERT_TRUE(resizer.get());
+  resizer->Drag(CalculateDragPoint(*resizer, -20, 0), 0);
+  resizer->CompleteDrag(0);
+  EXPECT_EQ("0,30 50x60", window_->bounds().ToString());
+}
+
 // Verifies a window can be moved from the primary display to another.
 TEST_F(WorkspaceWindowResizerTest, MAYBE_WindowDragWithMultiDisplays) {
   // The secondary display is logically on the right, but on the system (e.g. X)