Don't allow kiosk window resize

Previously the tablet resizer was allowing resize of almost all windows,
which caused http://crbug.com/985109. Now it actually works as intended.

Bug: 985109
Change-Id: Ibcac57f9a1dbd56c89925e3280723a7026d3683a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1758448Reviewed-by: Jun Mukai <mukai@chromium.org>
Commit-Queue: Anatoliy Potapchuk <apotapchuk@chromium.org>
Auto-Submit: Anatoliy Potapchuk <apotapchuk@chromium.org>
Cr-Commit-Position: refs/heads/master@{#690201}

ash/wm/workspace/workspace_window_resizer.cc

@@ -14,6 +14,7 @@
 #include "ash/public/cpp/shell_window_ids.h"
 #include "ash/root_window_controller.h"
 #include "ash/screen_util.h"
+#include "ash/session/session_controller_impl.h"
 #include "ash/shell.h"
 #include "ash/wm/default_window_resizer.h"
 #include "ash/wm/desks/desks_util.h"
@@ -143,6 +144,10 @@ std::unique_ptr<WindowResizer> CreateWindowResizer(
   if (window_state->drag_details())
     return nullptr;
 
+  // When running in single app mode, we should not create window resizer.
+  if (Shell::Get()->session_controller()->IsRunningInAppMode())
+    return nullptr;
+
   if (window_state->IsPip()) {
     window_state->CreateDragDetails(point_in_parent, window_component, source);
     return std::make_unique<PipWindowResizer>(window_state);

ash/wm/workspace/workspace_window_resizer_unittest.cc

@@ -1927,4 +1927,10 @@ TEST_F(MultiDisplayWorkspaceWindowResizerTest, Magnetism) {
   EXPECT_EQ(gfx::Rect(1150, 10, 100, 100), win1->GetBoundsInScreen());
 }
 
+// Makes sure that we are not creating any resizer in kiosk mode.
+TEST_F(WorkspaceWindowResizerTest, DoesNotWorkInAppMode) {
+  GetSessionControllerClient()->SetIsRunningInAppMode(true);
+  EXPECT_FALSE(CreateResizerForTest(window_.get(), gfx::Point(), HTCAPTION));
+}
+
 }  // namespace ash