Start combining threads in system process.

This introduces four generic thread that services can
use in the system process:

- Background: part of the framework for all processes, for
work that is purely background (no timing constraint).
- UI: for time-critical display of UI.
- Foreground: normal foreground work.
- IO: performing IO operations.

I went through and moved services into these threads in the
places I felt relatively comfortable about understanding what
they are doing.  There are still a bunch more we need to look
at -- lots of networking stuff left, 3 or so different native
daemon connectors which I didn't know how much would block,
audio stuff, etc.

Also updated Watchdog to be aware of and check these new
threads, with a new API for other threads to also participate
in this checking.

Change-Id: Ie2f11061cebde5f018d7383b3a910fbbd11d5e11

1 files changed, 3 insertions, 2 deletions

diff --git a/services/java/com/android/server/display/DisplayManagerService.java b/services/java/com/android/server/display/DisplayManagerService.java
index 17b0662..ca85e42 100644
--- a/services/java/com/android/server/display/DisplayManagerService.java
+++ b/services/java/com/android/server/display/DisplayManagerService.java
@@ -37,6 +37,7 @@ import android.util.Slog;
 import android.util.SparseArray;
 import android.view.Display;
 import android.view.DisplayInfo;
+import com.android.server.UiThread;
 
 import java.io.FileDescriptor;
 import java.io.PrintWriter;
@@ -190,12 +191,12 @@ public final class DisplayManagerService extends IDisplayManager.Stub {
     private final DisplayViewport mTempDefaultViewport = new DisplayViewport();
     private final DisplayViewport mTempExternalTouchViewport = new DisplayViewport();
 
-    public DisplayManagerService(Context context, Handler mainHandler, Handler uiHandler) {
+    public DisplayManagerService(Context context, Handler mainHandler) {
         mContext = context;
         mHeadless = SystemProperties.get(SYSTEM_HEADLESS).equals("1");
 
         mHandler = new DisplayManagerHandler(mainHandler.getLooper());
-        mUiHandler = uiHandler;
+        mUiHandler = UiThread.getHandler();
         mDisplayAdapterListener = new DisplayAdapterListener();
         mSingleDisplayDemoMode = SystemProperties.getBoolean("persist.demo.singledisplay", false);