Bug 718240 - Use 30 second timeout for crash restore. r=mfinkle

mobile/android/app/mobile.js

@@ -145,7 +145,7 @@ pref("browser.sessionhistory.max_entries", 50);
 
 /* session store */
 pref("browser.sessionstore.resume_session_once", false);
-pref("browser.sessionstore.resume_from_crash", true);
+pref("browser.sessionstore.resume_from_crash", false);
 pref("browser.sessionstore.resume_from_crash_timeout", 60); // minutes
 pref("browser.sessionstore.interval", 10000); // milliseconds
 pref("browser.sessionstore.max_tabs_undo", 1);

mobile/android/base/GeckoApp.java

@@ -1677,9 +1677,10 @@ abstract public class GeckoApp
         if (uri != null && uri.length() > 0)
             passedUri = mLastTitle = uri;
 
+        mRestoreSession |= getProfile().shouldRestoreSession();
         if (passedUri == null || passedUri.equals("about:home")) {
             // show about:home if we aren't restoring previous session
-            if (! getProfile().hasSession()) {
+            if (!mRestoreSession) {
                 mBrowserToolbar.updateTabCount(1);
                 showAboutHome();
             }

mobile/android/base/GeckoProfile.java

@@ -33,6 +33,9 @@ public final class GeckoProfile {
     private File mMozDir;
     private File mDir;
 
+    // this short timeout is a temporary fix until bug 735399 is implemented
+    private static final long SESSION_TIMEOUT = 30 * 1000; // 30 seconds
+
     public static GeckoProfile get(Context context) {
         return get(context, null);
     }
@@ -80,12 +83,19 @@ public final class GeckoProfile {
         return mDir;
     }
 
-    public boolean hasSession() {
+    public boolean shouldRestoreSession() {
         Log.w(LOGTAG, "zerdatime " + SystemClock.uptimeMillis() + " - start check sessionstore.js exists");
         File dir = getDir();
-        boolean hasSession = (dir != null && new File(dir, "sessionstore.js").exists());
+        if (dir == null)
+            return false;
+
+        File sessionFile = new File(dir, "sessionstore.js");
+        if (!sessionFile.exists())
+            return false;
+
+        boolean shouldRestore = (System.currentTimeMillis() - sessionFile.lastModified() < SESSION_TIMEOUT);
         Log.w(LOGTAG, "zerdatime " + SystemClock.uptimeMillis() + " - finish check sessionstore.js exists");
-        return hasSession;
+        return shouldRestore;
     }
 
     public String readSessionFile(boolean geckoReady) {