Add atom for general external storage access stats

Define a new pulled atom which will be logged in MediaProvider.
The atom collects general access stats for external storage:
* Total number of accesses
* Total number of file path accesses
* Total number of secondary storage accesses
* List of accesses mime types

Test: build
Test: make statsd_testdrive ; ./out/host/linux-x86/bin/statsd_testdrive \
      -p com.google.android.providers.media.module 10085
Bug: 149669087
Change-Id: Ic0ebb040a05ec06603f1a617f290af6a2f21916d

cmds/statsd/src/atoms.proto

@@ -588,6 +588,8 @@ message Atom {
         BytesTransferByTagAndMetered bytes_transfer_by_tag_and_metered =
                 10083 [(module) = "framework"];
         DNDModeProto dnd_mode_rule = 10084 [(module) = "framework"];
+        GeneralExternalStorageAccessStats general_external_storage_access_stats =
+            10085 [(module) = "mediaprovider"];
     }
 
     // DO NOT USE field numbers above 100,000 in AOSP.
@@ -4542,6 +4544,31 @@ message VmsClientConnectionStateChanged {
     optional State state  = 2;
 }
 
+message MimeTypes {
+    repeated string mime_types = 1;
+}
+
+/**
+ * Logs statistics regarding accesses to external storage.
+ * All stats are normalized for one day period.
+ *
+ * Logged from:
+ *   packages/providers/MediaProvider/src/com/android/providers/media/MediaProvider.java
+ */
+message GeneralExternalStorageAccessStats {
+    optional int32 uid = 1 [(is_uid) = true];
+    // Total number of accesses like creation, open, delete and rename/update.
+    // Includes file path and ContentResolver accesses
+    optional uint32 total_accesses = 2;
+    // Number of file path accesses, as opposed to file path and ContentResolver.
+    optional uint32 file_path_accesses = 3;
+    // Number of accesses on secondary volumes like SD cards.
+    // Includes file path and ContentResolver accesses
+    optional uint32 secondary_storage_accesses = 4;
+    // Comma-separated list of mime types that were accessed.
+    optional MimeTypes mime_types_accessed = 5;
+}
+
 /**
  * Logs when MediaProvider has successfully finished scanning a storage volume.
  *

cmds/statsd/tools/localtools/src/com/android/statsd/shelltools/testdrive/TestDrive.java

@@ -342,6 +342,9 @@ public class TestDrive {
                     .addPullAtomPackages(PullAtomPackages.newBuilder()
                             .setAtomId(Atom.TRAIN_INFO_FIELD_NUMBER)
                             .addPackages("AID_STATSD"))
+                    .addPullAtomPackages(PullAtomPackages.newBuilder()
+                            .setAtomId(Atom.GENERAL_EXTERNAL_STORAGE_ACCESS_STATS_FIELD_NUMBER)
+                            .addPackages("com.google.android.providers.media.module"))
                     .setHashStringsInMetricReport(false);
         }
     }