Move sync_wait for screen capture to client

Free up time from the SF's main thread by moving the fence waiting
to the client.

Test: Observe systrace of region sample thread
Test: adb shell screencap
Test: Recents takes the screenshot
Test: Rotate device
Test: Volume + power down for screenshot
Bug: 178649983
Change-Id: Ice70b8d2b95928a5adce19dbd1d91e73d8529f54

core/jni/android_view_SurfaceControl.cpp

@@ -262,7 +262,7 @@ public:
         }
     }
 
-    binder::Status onScreenCaptureComplete(
+    binder::Status onScreenCaptureCompleted(
             const gui::ScreenCaptureResults& captureResults) override {
         JNIEnv* env = getenv();
         if (captureResults.result != NO_ERROR || captureResults.buffer == nullptr) {
@@ -270,6 +270,7 @@ public:
                                 gScreenCaptureListenerClassInfo.onScreenCaptureComplete, nullptr);
             return binder::Status::ok();
         }
+        captureResults.fence->waitForever("");
         jobject jhardwareBuffer = android_hardware_HardwareBuffer_createFromAHardwareBuffer(
                 env, captureResults.buffer->toAHardwareBuffer());
         const jint namedColorSpace =