Mash: Show app icons in shelf based on the Widget's app icon

* Use the large icon from WidgetDelegate::GetWindowAppIcon().
* In the mojo app's NativeWidgetMus, serialize the icon's SkBitmap as a vector of bytes and set it as a shared window property.
* In the window manager, pass the serialized icon to any UserWindowObservers.
* In the system UI, deserialize the icon and use it on the shelf.
* Set an icon in task_viewer as a demonstration.

The window property serialization is handled by a custom TypeConverter for vector<uint8>, SkBitmap. In the future it would be nice to use the serialized form of the Skia Mojom struct skia.Bitmap, but that will require Mojo to generate a public API to read the serialized bytes.

Also fixed an issue where the app's primary widget and the window manager's non-client-frame widget would fight over window titles.

A screenshot of the shelf is attached to the bug.

BUG=595850
TEST=launch mash, run mojo:task_viewer, note QuickLaunch shelf icon is default but TaskViewer icon is a gear

Review URL: https://codereview.chromium.org/1824183002

Cr-Commit-Position: refs/heads/master@{#383312}

1 files changed, 9 insertions, 0 deletions

diff --git a/mash/task_viewer/task_viewer.cc b/mash/task_viewer/task_viewer.cc
index 0e01a00..fb5cb1f 100644
--- a/mash/task_viewer/task_viewer.cc
+++ b/mash/task_viewer/task_viewer.cc
@@ -19,6 +19,8 @@
 #include "mojo/shell/public/cpp/connector.h"
 #include "mojo/shell/public/interfaces/shell.mojom.h"
 #include "ui/base/models/table_model.h"
+#include "ui/base/resource/resource_bundle.h"
+#include "ui/resources/grit/ui_resources.h"
 #include "ui/views/background.h"
 #include "ui/views/controls/button/label_button.h"
 #include "ui/views/controls/table/table_view.h"
@@ -87,6 +89,13 @@ class TaskViewerContents : public views::WidgetDelegateView,
     return base::ASCIIToUTF16("Tasks");
   }
 
+  gfx::ImageSkia GetWindowAppIcon() override {
+    // TODO(jamescook): Create a new .pak file for this app and make a custom
+    // icon, perhaps one that looks like the Chrome OS task viewer icon.
+    ResourceBundle& rb = ResourceBundle::GetSharedInstance();
+    return *rb.GetImageSkiaNamed(IDR_NOTIFICATION_SETTINGS);
+  }
+
   // Overridden from views::View:
   void Layout() override {
     gfx::Rect bounds = GetLocalBounds();