Add API to turn on HW drawing in IMEs.

  public class InputMethodService extends android.inputmethodservice.AbstractInputMethodService {

    ctor public InputMethodService();

    method public boolean enableHardwareAcceleration();

    method public int getBackDisposition();

    method public int getCandidatesHiddenVisibility();

    method public android.view.inputmethod.InputBinding getCurrentInputBinding();

import static android.view.ViewGroup.LayoutParams.MATCH_PARENT;

import static android.view.ViewGroup.LayoutParams.WRAP_CONTENT;

import android.app.ActivityManager;

import android.app.Dialog;

import android.content.Context;

import android.content.res.Configuration;

import android.util.Log;

import android.util.PrintWriterPrinter;

import android.util.Printer;

import android.view.Display;

import android.view.KeyCharacterMap;

import android.view.KeyEvent;

import android.view.LayoutInflater;

    InputMethodManager mImm;

    int mTheme = 0;

    boolean mHardwareAccelerated = false;

    LayoutInflater mInflater;

    TypedArray mThemeAttrs;

        mTheme = theme;

    }

    /**

     * You can call this to try to enable hardware accelerated drawing for

     * your IME. This must be set before {@link #onCreate}, so you

     * will typically call it in your constructor.  It is not always possible

     * to use hardware acclerated drawing in an IME (for example on low-end

     * devices that do not have the resources to support this), so the call

     * returns true if it succeeds otherwise false if you will need to draw

     * in software.  You must be able to handle either case.

     */

    public boolean enableHardwareAcceleration() {

        if (mWindow != null) {

            throw new IllegalStateException("Must be called before onCreate()");

        }

        if (ActivityManager.isHighEndGfx(new Display(Display.DEFAULT_DISPLAY, null))) {

            mHardwareAccelerated = true;

            return true;

        }

        return false;

    }

    @Override public void onCreate() {

        mTheme = Resources.selectSystemTheme(mTheme,

                getApplicationInfo().targetSdkVersion,

        mInflater = (LayoutInflater)getSystemService(

                Context.LAYOUT_INFLATER_SERVICE);

        mWindow = new SoftInputWindow(this, mTheme, mDispatcherState);

        if (mHardwareAccelerated) {

            mWindow.getWindow().addFlags(WindowManager.LayoutParams.FLAG_HARDWARE_ACCELERATED);

        }

        initViews();

        mWindow.getWindow().setLayout(MATCH_PARENT, WRAP_CONTENT);

    }