Prevent maximize/minimize/fullscreen-ize window in trusted pinned mode.

ash/common/wm/default_state.cc

Index: ash/common/wm/default_state.cc
diff --git a/ash/common/wm/default_state.cc b/ash/common/wm/default_state.cc
index d17253e6a9187f68018c7fd5e483d8015509fa50..56dc1cd245120658c471f92924b7a38714639abe 100644
--- a/ash/common/wm/default_state.cc
+++ b/ash/common/wm/default_state.cc
@@ -164,6 +164,10 @@ DefaultState::DefaultState(WindowStateType initial_state_type)
 DefaultState::~DefaultState() {}
 
 void DefaultState::OnWMEvent(WindowState* window_state, const WMEvent* event) {
+  // Do not change the PINNED window state if this is not unpin event.
+  if (window_state->IsTrustedPinned() && event->type() != WM_EVENT_NORMAL)
+    return;

[oshima, 2016/12/21 21:18:23]

move this after workspace events because you still need to handle them in pinned
state and please add test to cover workspace/display size change.

[hidehiko, 2016/12/22 16:57:57]

Done. Added test in ash/wm/window_state_unittest.cc. Is it right place for this
case?

+
   if (ProcessWorkspaceEvents(window_state, event))
     return;