Chrome app manifest support for action handlers.

extensions/common/BUILD.gn

Index: extensions/common/BUILD.gn
diff --git a/extensions/common/BUILD.gn b/extensions/common/BUILD.gn
index a10fe58eee08bc38bc283602de791bb805832dfc..76f9221767d2f369940328195cb99ca2a444edd4 100644
--- a/extensions/common/BUILD.gn
+++ b/extensions/common/BUILD.gn
@@ -298,6 +298,13 @@ if (enable_extensions) {
         "manifest_handlers/nacl_modules_handler.h",
       ]
     }
+
+    if (is_chromeos) {
+      sources += [
+        "manifest_handlers/action_handlers_handler.cc",
+        "manifest_handlers/action_handlers_handler.h",
+      ]
+    }
   }
 
   source_set("unit_tests") {
@@ -365,5 +372,9 @@ if (enable_extensions) {
       "//ui/gfx",
       "//url",
     ]
+
+    if (is_chromeos) {
+      sources += [ "manifest_handlers/action_handlers_handler_unittest.cc" ]
+    }
   }
 }  # enable_extensions