Add a system property to control Skia reduceOpsTaskSplitting

We are testing this flag with a subset of devices in dogfood and
need to have this plumbing available.

Bug: 183612348
Change-Id: I8041053ff3da94b08cd6793fac3ff282bc73da9a

libs/hwui/renderthread/RenderThread.cpp

@@ -40,6 +40,7 @@
 #include <utils/Mutex.h>
 #include <thread>
 
+#include <android-base/properties.h>
 #include <ui/FatVector.h>
 
 namespace android {
@@ -251,6 +252,11 @@ void RenderThread::requireVkContext() {
 void RenderThread::initGrContextOptions(GrContextOptions& options) {
     options.fPreferExternalImagesOverES3 = true;
     options.fDisableDistanceFieldPaths = true;
+    if (android::base::GetBoolProperty(PROPERTY_REDUCE_OPS_TASK_SPLITTING, false)) {
+        options.fReduceOpsTaskSplitting = GrContextOptions::Enable::kYes;
+    } else {
+        options.fReduceOpsTaskSplitting = GrContextOptions::Enable::kNo;
+    }
 }
 
 void RenderThread::destroyRenderingContext() {

libs/hwui/renderthread/RenderThread.h

@@ -38,6 +38,12 @@
 #include "thread/ThreadBase.h"
 #include "utils/TimeUtils.h"
 
+/**
+ * (Bool) Turns on the Skia GPU option "reduceOpsTaskSplitting" which improves GPU
+ * efficiency but may increase VRAM consumption. Default is false.
+ */
+#define PROPERTY_REDUCE_OPS_TASK_SPLITTING "renderthread.skia.reduceopstasksplitting"
+
 namespace android {
 
 class Bitmap;