Return the freed bytes from deleteOdex API

This will help quantify the number of bytes we free for
telemetry purposes.

Test: installd_tests
Bug: 187458876
Change-Id: I8900816699834e0801d2bd9c770468db9c9db924

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

@@ -557,13 +557,17 @@ public class Installer extends SystemService {
         }
     }
 
-    public void deleteOdex(String apkPath, String instructionSet, String outputPath)
+    /**
+     * Deletes the optimized artifacts generated by ART and returns the number
+     * of freed bytes.
+     */
+    public long deleteOdex(String apkPath, String instructionSet, String outputPath)
             throws InstallerException {
-        if (!checkBeforeRemote()) return;
+        if (!checkBeforeRemote()) return -1;
         BlockGuard.getVmPolicy().onPathAccess(apkPath);
         BlockGuard.getVmPolicy().onPathAccess(outputPath);
         try {
-            mInstalld.deleteOdex(apkPath, instructionSet, outputPath);
+            return mInstalld.deleteOdex(apkPath, instructionSet, outputPath);
         } catch (Exception e) {
             throw InstallerException.from(e);
         }

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

@@ -25550,14 +25550,14 @@ public class PackageManagerService extends IPackageManager.Stub
         }
     }
 
-    void deleteOatArtifactsOfPackage(String packageName) {
+    long deleteOatArtifactsOfPackage(String packageName) {
         final AndroidPackage pkg;
         final PackageSetting pkgSetting;
         synchronized (mLock) {
             pkg = mPackages.get(packageName);
             pkgSetting = mSettings.getPackageLPr(packageName);
         }
-        mDexManager.deleteOptimizedFiles(ArtUtils.createArtPackageInfo(pkg, pkgSetting));
+        return mDexManager.deleteOptimizedFiles(ArtUtils.createArtPackageInfo(pkg, pkgSetting));
     }
 
     Set<String> getUnusedPackages(long downgradeTimeThresholdMillis) {

services/core/java/com/android/server/pm/dex/DexManager.java

@@ -1034,18 +1034,26 @@ public class DexManager {
 
     /**
      * Deletes all the optimizations files generated by ART.
+     * This is best effort, and the method will log but not throw errors
+     * for individual deletes
+     *
      * @param packageInfo the package information.
+     * @return the number of freed bytes or -1 if there was an error in the process.
      */
-    public void deleteOptimizedFiles(ArtPackageInfo packageInfo) {
+    public long deleteOptimizedFiles(ArtPackageInfo packageInfo) {
+        long freedBytes = 0;
+        boolean hadErrors = false;
         for (String codePath : packageInfo.getCodePaths()) {
             for (String isa : packageInfo.getInstructionSets()) {
                 try {
-                    mInstaller.deleteOdex(codePath, isa, packageInfo.getOatDir());
+                    freedBytes += mInstaller.deleteOdex(codePath, isa, packageInfo.getOatDir());
                 } catch (InstallerException e) {
                     Log.e(TAG, "Failed deleting oat files for " + codePath, e);
+                    hadErrors = true;
                 }
             }
         }
+        return hadErrors ? -1 : freedBytes;
     }
 
     public static class RegisterDexModuleResult {