arc-app-launcher: Minimal support for ARC app launcher.

chrome/chrome_browser_ui.gypi

Index: chrome/chrome_browser_ui.gypi
diff --git a/chrome/chrome_browser_ui.gypi b/chrome/chrome_browser_ui.gypi
index 03b508fe1ffdb4bf6783c6f9ddb2e518c5043968..dadfd11495458b6e18abc10570c592c96f7d0b98 100644
--- a/chrome/chrome_browser_ui.gypi
+++ b/chrome/chrome_browser_ui.gypi
@@ -718,6 +718,19 @@
       'browser/ui/views/select_file_dialog_extension_factory.cc',
       'browser/ui/views/select_file_dialog_extension_factory.h',
     ],
+    # ARC-only sources.
+    'chrome_browser_ui_chromeos_arc_sources': [
+      'browser/ui/app_list/arc_app_icon.cc',
+      'browser/ui/app_list/arc_app_icon.h',
+      'browser/ui/app_list/arc_app_item.cc',
+      'browser/ui/app_list/arc_app_item.h',
+      'browser/ui/app_list/arc_app_list_prefs_factory.cc',
+      'browser/ui/app_list/arc_app_list_prefs_factory.h',
+      'browser/ui/app_list/arc_app_list_prefs.cc',
+      'browser/ui/app_list/arc_app_list_prefs.h',
+      'browser/ui/app_list/arc_app_model_builder.cc',
+      'browser/ui/app_list/arc_app_model_builder.h',
+    ],
     # ChromeOS sources that should not be included in the official build.
     'chrome_browser_ui_chromeos_non_official_sources': [
       'browser/ui/webui/chromeos/emulator/device_emulator_message_handler.cc',
@@ -2938,6 +2951,9 @@
             '../ui/chromeos/ui_chromeos.gyp:ui_chromeos_resources',
           ],
         }],
+        ['chromeos==1 and enable_arc == 1', {

[elijahtaylor (use chromium), 2015/11/19 05:52:00]

nit: looks like the convention is enable_arc==1

[khmel1, 2015/11/19 17:11:41]

Actually there are different styles currently in the code:
for example: 

chrome/chrome_browser_chromeos.gypi uses  enable_arc
chrome/browser/ui/BUILD.gn uses both.
components/components_tests.gyp uses both.
and so on.


most uses both defines. IMHO it is better to unify everything
in separate CL.

[elijahtaylor (use chromium), 2015/11/19 17:45:49]

Sorry I was being super nitty and meant "enable_arc==1" (no spaces) instead of
"enable_arc == 1" (with spaces).  I think checking chromeos and enable_arc is
fine and matches a lot of other checks I've seen.

[khmel1, 2015/11/24 09:41:03]

:) Done

+          'sources': [ '<@(chrome_browser_ui_chromeos_arc_sources)' ],
+        }],
         ['use_cups==1', {
           'dependencies': [
             '../printing/printing.gyp:cups',