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..0d06a024e80b60884999b1964d162d6d08049f20 100644
--- a/components/arc/common/app.mojom
+++ b/components/arc/common/app.mojom
@@ -75,6 +75,17 @@ enum ShowPackageInfoPage {
   MANAGE_LINKS = 1,
 };
 
+// Describes a Play Store app discovery result.
+struct AppDiscoveryResult {
+  string launch_intent_uri;

[Luis Héctor Chávez, 2017/06/19 17:51:53]

All the strings seem to be optional from the Android-side change. make them all
"string?", please.

[Jiaquan He, 2017/06/22 04:30:04]

Done.

+  string install_intent_uri;
+  string label;
+  bool is_instant_app;
+  bool is_recent;
+  string publisher_name;
+  array<uint8> icon_png_data;
+};
+
 // Next method ID: 18

[Luis Héctor Chávez, 2017/06/16 22:24:35]

Next method ID: 19

[Jiaquan He, 2017/06/22 04:30:04]

Done.

 interface AppHost {
   // Sends newly added ARC app to Chrome. This message is sent when ARC receives
@@ -233,4 +244,9 @@ 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 Play Store apps.
+  [MinVersion=18] GetRecentAndSuggestedAppsFromPlayStore@16(

[Luis Héctor Chávez, 2017/06/16 22:24:35]

MinVersion=20

[Jiaquan He, 2017/06/22 04:30:04]

Done.

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