[pm/metrics] add apk size in the log

Sum up all apk sizes in the code path and record in the log.

Test: atest android.content.pm.cts.PackageManagerShellCommandTest#testSplitsInstallStdIn
Test: out/host/linux-x86/bin/statsd_testdrive 263
event_metrics {
  data {
    elapsed_timestamp_nanos: 1543983836620
    atom {
      package_installer_v2_reported {
        is_incremental: true
        package_name: ""
        duration_millis: 327
        return_code: 1
        size: 2512345
      }
    }
  }
}
BUG: 152913040
Change-Id: Idde0adb6b639163627c092ed248631edfba2e952

Change-Id: I0eaf226513ee5a1b5f73726f4480c6ee73210b0d

cmds/statsd/src/atoms.proto

@@ -9327,6 +9327,8 @@ message PackageInstallerV2Reported {
     // Return_code 1 indicates success.
     // For full list, see frameworks/base/core/java/android/content/pm/PackageManager.java
     optional int32 return_code  = 4;
+    // Total size of the APKs installed for this package
+    optional int64 apks_size_bytes = 5;
 }
 
 /**

services/core/java/com/android/server/pm/PackageInstallerSession.java

@@ -1812,7 +1812,33 @@ public class PackageInstallerSession extends IPackageInstallerSession.Stub {
                 isIncrementalInstallation(),
                 packageNameToLog,
                 currentTimestamp - createdMillis,
-                returnCode);
+                returnCode,
+                getApksSize());
+    }
+
+    private long getApksSize() {
+        final PackageSetting ps = mPm.getPackageSetting(mPackageName);
+        if (ps == null) {
+            return 0;
+        }
+        final File apkDirOrPath = ps.codePath;
+        if (apkDirOrPath == null) {
+            return 0;
+        }
+        if (apkDirOrPath.isFile() && apkDirOrPath.getName().toLowerCase().endsWith(".apk")) {
+            return apkDirOrPath.length();
+        }
+        if (!apkDirOrPath.isDirectory()) {
+            return 0;
+        }
+        final File[] files = apkDirOrPath.listFiles();
+        long apksSize = 0;
+        for (int i = 0; i < files.length; i++) {
+            if (files[i].getName().toLowerCase().endsWith(".apk")) {
+                apksSize += files[i].length();
+            }
+        }
+        return apksSize;
     }
 
     /**