Add ability to change context priority of RT GL context

Test: Use method, observe GPU preemption behavior
Bug: 75985430
Change-Id: Idc08d37f8c95f52c5aab7edf09c0cbff72b8482d
diff --git a/libs/hwui/Properties.cpp b/libs/hwui/Properties.cpp
index 1602b4b..0a6c45b 100644
--- a/libs/hwui/Properties.cpp
+++ b/libs/hwui/Properties.cpp
@@ -65,6 +65,8 @@
 bool Properties::debuggingEnabled = false;
 bool Properties::isolatedProcess = false;
 
+int Properties::contextPriority = 0;
+
 static int property_get_int(const char* key, int defaultValue) {
     char buf[PROPERTY_VALUE_MAX] = {
             '\0',