Faster all the things!

 Bug: 5177959
 Improve browser startup. Elinate IO access on UI thread during startup
 by removing the super legacy ClearThumbnails task. Also rework how
 the hardware acceleration debug setting works to remove the requirement
 for initialized BrowserSettings in onCreate

Change-Id: I4c1014d380827af4833586e6a3ae842fd59aa48b

6 files changed, 18 insertions, 67 deletions

diff --git a/src/com/android/browser/BrowserActivity.java b/src/com/android/browser/BrowserActivity.java
index 084ace0..690e29f 100644
--- a/src/com/android/browser/BrowserActivity.java
+++ b/src/com/android/browser/BrowserActivity.java
@@ -65,24 +65,6 @@ public class BrowserActivity extends Activity {
             return;
         }
 
-        BrowserSettings settings = BrowserSettings.getInstance();
-
-        // render the browser in OpenGL
-        if (settings.isHardwareAccelerated()) {
-            // Set the flag in the activity's window
-            this.getWindow().setFlags(WindowManager.LayoutParams.FLAG_HARDWARE_ACCELERATED,
-                    WindowManager.LayoutParams.FLAG_HARDWARE_ACCELERATED);
-        } else {
-            // Clear the flag in the activity's window
-            this.getWindow().setFlags(0, WindowManager.LayoutParams.FLAG_HARDWARE_ACCELERATED);
-        }
-
-        AccessibilityManager accessibilityManager = (AccessibilityManager)
-                getSystemService(ACCESSIBILITY_SERVICE);
-        if (accessibilityManager != null && accessibilityManager.isEnabled()) {
-            setDefaultKeyMode(DEFAULT_KEYS_DISABLE);
-        }
-
         mController = new Controller(this, icicle == null);
         boolean xlarge = isTablet(this);
         if (xlarge) {
diff --git a/src/com/android/browser/BrowserSettings.java b/src/com/android/browser/BrowserSettings.java
index ad42146..d4f1ba3 100644
--- a/src/com/android/browser/BrowserSettings.java
+++ b/src/com/android/browser/BrowserSettings.java
@@ -405,7 +405,6 @@ public class BrowserSettings implements OnSharedPreferenceChangeListener,
     }
 
     public boolean isDebugEnabled() {
-        requireInitialization();
         return mPrefs.getBoolean(PREF_DEBUG_MENU, false);
     }
 
diff --git a/src/com/android/browser/Controller.java b/src/com/android/browser/Controller.java
index 24072c9..51bcda2 100644
--- a/src/com/android/browser/Controller.java
+++ b/src/com/android/browser/Controller.java
@@ -87,7 +87,6 @@ import com.android.browser.search.SearchEngine;
 import com.android.common.Search;
 
 import java.io.ByteArrayOutputStream;
-import java.io.File;
 import java.net.URLEncoder;
 import java.util.ArrayList;
 import java.util.Calendar;
@@ -215,20 +214,6 @@ public class Controller
 
     private boolean mBlockEvents;
 
-    private static class ClearThumbnails extends AsyncTask<File, Void, Void> {
-        @Override
-        public Void doInBackground(File... files) {
-            if (files != null) {
-                for (File f : files) {
-                    if (!f.delete()) {
-                        Log.e(LOGTAG, f.getPath() + " was not deleted");
-                    }
-                }
-            }
-            return null;
-        }
-    }
-
     public Controller(Activity browser, boolean preloadCrashState) {
         mActivity = browser;
         mSettings = BrowserSettings.getInstance();
@@ -354,11 +339,6 @@ public class Controller
             // Handle the intent
             mIntentHandler.onNewIntent(intent);
         }
-        // clear up the thumbnail directory, which is no longer used;
-        // ideally this should only be run once after an upgrade from
-        // a previous version of the browser
-        new ClearThumbnails().execute(mTabControl.getThumbnailDir()
-                .listFiles());
         // Read JavaScript flags if it exists.
         String jsFlags = getSettings().getJsEngineFlags();
         if (jsFlags.trim().length() != 0) {
diff --git a/src/com/android/browser/Tab.java b/src/com/android/browser/Tab.java
index abc2467..d7ce29b 100644
--- a/src/com/android/browser/Tab.java
+++ b/src/com/android/browser/Tab.java
@@ -1664,6 +1664,7 @@ class Tab implements PictureListener {
 
     void resume() {
         if (mMainView != null) {
+            setupHwAcceleration(mMainView);
             mMainView.onResume();
             if (mSubView != null) {
                 mSubView.onResume();
@@ -1671,6 +1672,16 @@ class Tab implements PictureListener {
         }
     }
 
+    private void setupHwAcceleration(View web) {
+        if (web == null) return;
+        BrowserSettings settings = BrowserSettings.getInstance();
+        if (settings.isHardwareAccelerated()) {
+            web.setLayerType(View.LAYER_TYPE_NONE, null);
+        } else {
+            web.setLayerType(View.LAYER_TYPE_SOFTWARE, null);
+        }
+    }
+
     void pause() {
         if (mMainView != null) {
             mMainView.onPause();
diff --git a/src/com/android/browser/TabControl.java b/src/com/android/browser/TabControl.java
index 38a46a8..e99071a 100644
--- a/src/com/android/browser/TabControl.java
+++ b/src/com/android/browser/TabControl.java
@@ -20,7 +20,6 @@ import android.os.Bundle;
 import android.util.Log;
 import android.webkit.WebView;
 
-import java.io.File;
 import java.util.ArrayList;
 import java.util.HashMap;
 import java.util.List;
@@ -51,7 +50,6 @@ class TabControl {
     // the main browser controller
     private final Controller mController;
 
-    private final File mThumbnailDir;
     private OnThumbnailUpdatedListener mOnThumbnailUpdatedListener;
 
     /**
@@ -59,8 +57,6 @@ class TabControl {
      */
     TabControl(Controller controller) {
         mController = controller;
-        mThumbnailDir = mController.getActivity()
-                .getDir("thumbnails", 0);
         mMaxTabs = mController.getMaxTabs();
         mTabs = new ArrayList<Tab>(mMaxTabs);
         mTabQueue = new ArrayList<Tab>(mMaxTabs);
@@ -70,10 +66,6 @@ class TabControl {
         return sNextId++;
     }
 
-    File getThumbnailDir() {
-        return mThumbnailDir;
-    }
-
     /**
      * Return the current tab's main WebView. This will always return the main
      * WebView for a given tab and not a subwindow.
diff --git a/src/com/android/browser/preferences/DebugPreferencesFragment.java b/src/com/android/browser/preferences/DebugPreferencesFragment.java
index 566eee2..24821d1 100644
--- a/src/com/android/browser/preferences/DebugPreferencesFragment.java
+++ b/src/com/android/browser/preferences/DebugPreferencesFragment.java
@@ -16,21 +16,18 @@
 
 package com.android.browser.preferences;
 
-import com.android.browser.BrowserActivity;
-import com.android.browser.BrowserSettings;
-import com.android.browser.GoogleAccountLogin;
-import com.android.browser.PreferenceKeys;
-import com.android.browser.R;
-
-import android.content.Intent;
 import android.os.Bundle;
 import android.preference.Preference;
-import android.preference.Preference.OnPreferenceChangeListener;
 import android.preference.Preference.OnPreferenceClickListener;
 import android.preference.PreferenceFragment;
 
+import com.android.browser.BrowserSettings;
+import com.android.browser.GoogleAccountLogin;
+import com.android.browser.PreferenceKeys;
+import com.android.browser.R;
+
 public class DebugPreferencesFragment extends PreferenceFragment
-        implements OnPreferenceChangeListener, OnPreferenceClickListener {
+        implements OnPreferenceClickListener {
     @Override
     public void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
@@ -38,21 +35,11 @@ public class DebugPreferencesFragment extends PreferenceFragment
         // Load the XML preferences file
         addPreferencesFromResource(R.xml.debug_preferences);
 
-        Preference e = findPreference(PreferenceKeys.PREF_ENABLE_HARDWARE_ACCEL);
-        e.setOnPreferenceChangeListener(this);
-        e = findPreference(PreferenceKeys.PREF_RESET_PRELOGIN);
+        Preference e = findPreference(PreferenceKeys.PREF_RESET_PRELOGIN);
         e.setOnPreferenceClickListener(this);
     }
 
     @Override
-    public boolean onPreferenceChange(Preference preference, Object newValue) {
-        // Attempt to restart
-        startActivity(new Intent(BrowserActivity.ACTION_RESTART, null,
-                getActivity(), BrowserActivity.class));
-        return true;
-    }
-
-    @Override
     public boolean onPreferenceClick(Preference preference) {
         if (PreferenceKeys.PREF_RESET_PRELOGIN.equals(preference.getKey())) {
             BrowserSettings.getInstance().getPreferences().edit()