Quick Update. When I ran the Log output files when trying to do ProfileGPU in the console, this happens on my Note 4 on UE4 project running in GearVR mode:
D/UE4 ( 9239): Assertion failed: ShaderRef != NULL && *ShaderRef != NULL [File:Runtime/ShaderCore/Public\Shader.h] [Line: 926]
D/UE4 ( 9239): Failed to find shader type FOpenGLRHILongGPUTaskPS
D/UE4 ( 9239): [2015.05.05-04.05.12:688] 0]Assertion failed: Assertion failed: ShaderRef != NULL && *ShaderRef != NULL [File:Runtime/ShaderCore/Public\Shader.h] [Line: 926]
D/UE4 ( 9239): Failed to find shader type FOpenGLRHILongGPUTaskPS
V/VRSVC ( 9190): at (VRManagerService.java:835) yTqX() [setVRPerformanceMode enable = false]