Add the Play Store app search to the launcher.

components/arc/common/app.mojom

Index: components/arc/common/app.mojom
diff --git a/components/arc/common/app.mojom b/components/arc/common/app.mojom
index 6348d52517e4851ebe484d466b77707bf5585eb3..e1f10f26fa1561fa2df34f612dde772ba49d7c41 100644
--- a/components/arc/common/app.mojom
+++ b/components/arc/common/app.mojom
@@ -8,6 +8,7 @@ module arc.mojom;
 
 import "scale_factor.mojom";
 import "screen_rect.mojom";
+import "app_discovery_result.mojom";
 
 // Describes OrientationLock request.
 // Note: ChromeOS currently assumes the internal panel is always landscape.
@@ -233,4 +234,9 @@ interface AppInstance {
   // Sends a request to ARC to uninstall the given package.  Error (if ever
   // happens) is ignored, and uninstall option should appear in the UI.
   [MinVersion=2] UninstallPackage@5(string package_name);
+
+  // Starts a query for Playstore apps.

[Luis Héctor Chávez, 2017/06/15 15:37:25]

nit: Play Store.

[Jiaquan He, 2017/06/15 19:23:30]

Done.

+  [MinVersion=18] GetRecentAndSuggestedApps@16(

[Luis Héctor Chávez, 2017/06/15 15:37:25]

I think it's better to explicitly mention that this comes from play store in the
method name:

GetRecentAndSuggestedAppsFromPlayStore.

[Jiaquan He, 2017/06/15 19:23:31]

Done.

+      string query, int32 max_results) =>
+          (array<AppDiscoveryResult> results);
 };