arc: Add methods to IntentHelperInstance to read ARC contents

components/arc/common/intent_helper.mojom

Index: components/arc/common/intent_helper.mojom
diff --git a/components/arc/common/intent_helper.mojom b/components/arc/common/intent_helper.mojom
index 14c7212e3cc00bdbd26095e82d8714312620720a..ed4f217bb620e459b4651800a4eabf80e401bf9d 100644
--- a/components/arc/common/intent_helper.mojom
+++ b/components/arc/common/intent_helper.mojom
@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 //
-// Next MinVersion: 15
+// Next MinVersion: 16
 
 module arc.mojom;
 
@@ -108,7 +108,7 @@ interface IntentHelperHost {
 };
 
 // Sends intents to ARC on behalf of Chrome.
-// Next method ID: 11
+// Next method ID: 13
 interface IntentHelperInstance {
   // Sets the given package as a preferred package. The next time an ACTION_VIEW
   // intent is sent with a URL that requires disambiguation, instead of opening
@@ -116,6 +116,9 @@ interface IntentHelperInstance {
   // When multiple packages are set as preferred, the most recent setting wins.
   [MinVersion=7] AddPreferredPackage@8(string package_name);
 
+  // Asks the ContentResolver for the size of the file specified by the URL.
+  [MinVersion=15] GetFileSize@11(string url) => (int64 size);
+
   // Passes an intent to an activity.
   [MinVersion=12] HandleIntent@10(IntentInfo intent, ActivityName activity);
 
@@ -131,6 +134,10 @@ interface IntentHelperInstance {
   // Establishes full-duplex communication with the host.
   Init@0(IntentHelperHost host_ptr);
 
+  // Asks the ContentResolver to get an FD to read the file specified by the
+  // URL.
+  [MinVersion=15] OpenFileToRead@12(string url) => (handle fd);
+
   // Requests 48dp * 48dp icons of the |activities| suitable for the
   // |scale_factor|. An array of icon data will be returned.
   [MinVersion=3] RequestActivityIcons@4(array<ActivityName> activities,