A better HW Bitmap uploader

Move all HW bitmap upload operations off of RenderThread.
Ensure EGL context outlives all upload requests

Bug: 79250950
Test: builds, boots, systrace is good, CTS bitmap tests pass

Change-Id: I5ace6c516d33b1afdf1a407cd8b183f6b60c22c1
diff --git a/libs/hwui/thread/ThreadBase.h b/libs/hwui/thread/ThreadBase.h
index 8068121..f9de8a5 100644
--- a/libs/hwui/thread/ThreadBase.h
+++ b/libs/hwui/thread/ThreadBase.h
@@ -47,6 +47,8 @@
 
     void join() { Thread::join(); }
 
+    bool isRunning() const { return Thread::isRunning(); }
+
 protected:
     void waitForWork() {
         nsecs_t nextWakeup;