[Android WebView] Implement copying and uploading of Minidumps.

android_webview/java/src/org/chromium/android_webview/crash/MinidumpUploadJobService.java

+// Copyright 2016 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+package org.chromium.android_webview.crash;
+
+import android.annotation.TargetApi;
+import android.app.job.JobParameters;
+import android.app.job.JobService;
+import android.os.Build;
+
+import org.chromium.base.ContextUtils;
+
+/**
+ * Class that interacts with the Android JobScheduler to upload Minidumps at appropriate times.
+ */
+@TargetApi(Build.VERSION_CODES.LOLLIPOP)
+// OBS: This class needs to be public to be started from android.app.ActivityThread.
+public class MinidumpUploadJobService extends JobService {
+    Object mRunningLock = new Object();
+    boolean mRunningJob = false;
+    MinidumpUploader mMinidumpUploader;
+
+    @Override
+    public void onCreate() {
+        super.onCreate();
+        SynchronizedWebViewCommandLine.initOnSeparateThread();
+    }
+
+    @Override
+    public boolean onStartJob(JobParameters params) {
+        // Ensure we can use ContextUtils later on (from minidump_uploader component).
+        ContextUtils.initApplicationContext(this.getApplicationContext());
+
+        // Ensure we only run one job at a time.
+        synchronized (mRunningLock) {
+            assert !mRunningJob;
+            mRunningJob = true;
+        }
+        mMinidumpUploader = new MinidumpUploaderImpl(this, true /* cleanOutMinidumps */);
+        mMinidumpUploader.uploadAllMinidumps(createJobFinishedCallback(params));
+        return true; // true = processing work on a separate thread, false = done already.
+    }
+
+    @Override
+    public boolean onStopJob(JobParameters params) {
+        boolean reschedule = mMinidumpUploader.cancelUploads();
+        synchronized (mRunningLock) {
+            mRunningJob = false;
+        }
+        return reschedule;
+    }
+
+    private MinidumpUploader.UploadsFinishedCallback createJobFinishedCallback(
+            final JobParameters params) {
+        return new MinidumpUploader.UploadsFinishedCallback() {
+            @Override
+            public void uploadsFinished(boolean reschedule) {
+                synchronized (mRunningLock) {
+                    mRunningJob = false;
+                }
+                MinidumpUploadJobService.this.jobFinished(params, reschedule);
+            }
+        };
+    }
+
+    @Override
+    public void onDestroy() {
+        mMinidumpUploader = null;
+        super.onDestroy();
+    }
+}