Upstream ChromeMobileApplication bits about sync browser initialization

chrome/android/java/src/org/chromium/chrome/browser/ChromeCommandLineInitUtil.java

Index: chrome/android/java/src/org/chromium/chrome/browser/ChromeCommandLineInitUtil.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/ChromeCommandLineInitUtil.java b/chrome/android/java/src/org/chromium/chrome/browser/ChromeCommandLineInitUtil.java
new file mode 100644
index 0000000000000000000000000000000000000000..e574da46cc8f380af6d0cdd4bd82d639d3dfb2e3
--- /dev/null
+++ b/chrome/android/java/src/org/chromium/chrome/browser/ChromeCommandLineInitUtil.java
@@ -0,0 +1,100 @@
+// Copyright 2015 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.chrome.browser;
+
+import android.annotation.SuppressLint;
+import android.content.Context;
+import android.os.Build;
+import android.provider.Settings;
+import android.util.Log;
+
+import org.chromium.base.CommandLine;
+
+import java.io.File;
+
+/**
+ * Provides implementation of command line initialization for Chrome for Android.
+ */
+public final class ChromeCommandLineInitUtil {
+
+    private static final String TAG = "ChromeCommandLineInitUtil";
+
+    /**
+     * The location of the command line file needs to be in a protected
+     * directory so requires root access to be tweaked, i.e., no other app in a
+     * regular (non-rooted) device can change this file's contents.
+     * See below for debugging on a regular (non-rooted) device.
+     */
+    private static final String COMMAND_LINE_FILE_PATH = "/data/local";
+
+    /**
+     * This path (writable by the shell in regular non-rooted "user" builds) is used when:
+     * 1) The "debug app" is set to chrome
+     * and
+     * 2) ADB is enabled.
+     *
+     */
+    private static final String COMMAND_LINE_FILE_PATH_DEBUG_APP = "/data/local/tmp";
+    private static final String COMMAND_LINE_FILE = "chrome-command-line";
+
+    private ChromeCommandLineInitUtil() {
+    }
+
+    public static void initChromeCommandLine(Context context) {
+        if (!CommandLine.isInitialized()) {
+            File commandLineFile = getAlternativeCommandLinePath(context);
+            if (commandLineFile == null) {
+                commandLineFile = new File(COMMAND_LINE_FILE_PATH, COMMAND_LINE_FILE);
+            }
+            CommandLine.initFromFile(commandLineFile.getPath());
+        }
+    }
+
+    /**
+     * Use an alternative path if adb is enabled and the debug app is chrome.
+     */
+    private static File getAlternativeCommandLinePath(Context context) {
+        File alternativeCommandLineFile =
+                new File(COMMAND_LINE_FILE_PATH_DEBUG_APP, COMMAND_LINE_FILE);
+        if (!alternativeCommandLineFile.exists()) return null;
+        try {
+            String debugApp = Build.VERSION.SDK_INT < 17
+                    ? getDebugAppPreJBMR1(context) : getDebugAppJBMR1(context);
+
+            if (debugApp != null
+                    && debugApp.equals(context.getApplicationContext().getPackageName())) {
+                Log.i(TAG, "Using alternative command line file in "
+                        + alternativeCommandLineFile.getPath());
+                return alternativeCommandLineFile;
+            }
+        } catch (RuntimeException e) {
+            Log.e(TAG, "Unable to detect alternative command line file");
+        }
+
+        return null;
+    }
+
+    @SuppressLint("NewApi")
+    private static String getDebugAppJBMR1(Context context) {
+        boolean adbEnabled = Settings.Global.getInt(context.getContentResolver(),
+                Settings.Global.ADB_ENABLED, 0) == 1;
+        if (adbEnabled) {
+            return Settings.Global.getString(context.getContentResolver(),
+                    Settings.Global.DEBUG_APP);
+        }
+        return null;
+    }
+
+    @SuppressWarnings("deprecation")
+    private static String getDebugAppPreJBMR1(Context context) {
+        boolean adbEnabled = Settings.System.getInt(context.getContentResolver(),
+                Settings.System.ADB_ENABLED, 0) == 1;
+        if (adbEnabled) {
+            return Settings.System.getString(context.getContentResolver(),
+                    Settings.System.DEBUG_APP);
+        }
+        return null;
+    }
+}