Move process stats screen into memory screen.

- Move process stats from developer options to top level
   settings item.
 - Some minor UI changes to the top of the page
 - Major UI updates to detail page, now shows info with processes
   as pref categories and services as prefs, with a way to kill
   them (taken from Running Services page).
 - Some major refactorings in code, in attempt to make it more
   usable
 - Added color bar on per app basis to visualize the avg/max
   relationship
 - Updated the way avg is calculated across multiple entries in
   ProcStatsPackageEntry to be more accurate
 - Change the way max memory is calculated in
   ProcStatsPackageEntry to be less accurate but more useful

Bug: 19443802
Change-Id: Ia6aaabe42c415c50997a09bfb814a6f6e5731772

src/com/android/settings/CancellablePreference.java

@@ -0,0 +1,69 @@
+/*
+ * Copyright (C) 2015 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package com.android.settings;
+
+import android.content.Context;
+import android.preference.Preference;
+import android.util.AttributeSet;
+import android.view.View;
+import android.view.View.OnClickListener;
+import android.widget.ImageView;
+
+public class CancellablePreference extends Preference implements OnClickListener {
+
+    private boolean mCancellable;
+    private OnCancelListener mListener;
+
+    public CancellablePreference(Context context) {
+        super(context);
+        setWidgetLayoutResource(R.layout.cancel_pref_widget);
+    }
+
+    public CancellablePreference(Context context, AttributeSet attrs) {
+        super(context, attrs);
+        setWidgetLayoutResource(R.layout.cancel_pref_widget);
+    }
+
+    public void setCancellable(boolean isCancellable) {
+        mCancellable = isCancellable;
+        notifyChanged();
+    }
+
+    public void setOnCancelListener(OnCancelListener listener) {
+        mListener = listener;
+    }
+
+    @Override
+    protected void onBindView(View view) {
+        super.onBindView(view);
+
+        ImageView cancel = (ImageView) view.findViewById(R.id.cancel);
+        cancel.setVisibility(mCancellable ? View.VISIBLE : View.INVISIBLE);
+        cancel.setOnClickListener(this);
+    }
+
+    @Override
+    public void onClick(View v) {
+        if (mListener != null) {
+            mListener.onCancel(this);
+        }
+    }
+
+    public interface OnCancelListener {
+        void onCancel(CancellablePreference preference);
+    }
+
+}