Update secure output flags on display changes.

This patch adds a WindowTreeHostManager::Observer to exo that
sets the appropriate output secure flag to the compositors
when the display configuration changes.

The first iteration for the logic that determines if the output
is secure is simply a check if the connected display is internal and
mirroring is disabled on all the devices.

Additionally this patch moves the 'is_secure_' flag from the OutputSurface
to LayerTreeImpl, since the lifetime of the latter better matches the
display configuration changes.

BUG=b/27173841,b/27174223
CQ_INCLUDE_TRYBOTS=tryserver.blink:linux_blink_rel

Review URL: https://codereview.chromium.org/1821553002

Cr-Commit-Position: refs/heads/master@{#382683}

1 files changed, 10 insertions, 0 deletions

diff --git a/ash/display/window_tree_host_manager.cc b/ash/display/window_tree_host_manager.cc
index 4b59621..13e143b 100644
--- a/ash/display/window_tree_host_manager.cc
+++ b/ash/display/window_tree_host_manager.cc
@@ -775,6 +775,16 @@ void WindowTreeHostManager::PostDisplayConfigurationChange() {
                               : layout.primary_id);
     }
   }
+
+  for (const gfx::Display& display : display_manager->active_display_list()) {
+    bool output_is_secure =
+        !display_manager->IsInMirrorMode() && display.IsInternal();
+    GetAshWindowTreeHostForDisplayId(display.id())
+        ->AsWindowTreeHost()
+        ->compositor()
+        ->SetOutputIsSecure(output_is_secure);
+  }
+
   FOR_EACH_OBSERVER(Observer, observers_, OnDisplayConfigurationChanged());
   UpdateMouseLocationAfterDisplayChange();
 }