Made Element accessors thread-safe

Bug: 28177082
Change-Id: I8f3f2d8ce559e93cba29f8eedd5b95d1389deb23
(cherry picked from commit 33703f0c4e9b16bda5fd72e71d7d89359ee0db17)
diff --git a/rs/java/android/renderscript/RenderScript.java b/rs/java/android/renderscript/RenderScript.java
index 2650e5a..3d1370a 100644
--- a/rs/java/android/renderscript/RenderScript.java
+++ b/rs/java/android/renderscript/RenderScript.java
@@ -1037,97 +1037,97 @@
     @SuppressWarnings({"FieldCanBeLocal"})
     MessageThread mMessageThread;
 
-    Element mElement_U8;
-    Element mElement_I8;
-    Element mElement_U16;
-    Element mElement_I16;
-    Element mElement_U32;
-    Element mElement_I32;
-    Element mElement_U64;
-    Element mElement_I64;
-    Element mElement_F16;
-    Element mElement_F32;
-    Element mElement_F64;
-    Element mElement_BOOLEAN;
+    volatile Element mElement_U8;
+    volatile Element mElement_I8;
+    volatile Element mElement_U16;
+    volatile Element mElement_I16;
+    volatile Element mElement_U32;
+    volatile Element mElement_I32;
+    volatile Element mElement_U64;
+    volatile Element mElement_I64;
+    volatile Element mElement_F16;
+    volatile Element mElement_F32;
+    volatile Element mElement_F64;
+    volatile Element mElement_BOOLEAN;
 
-    Element mElement_ELEMENT;
-    Element mElement_TYPE;
-    Element mElement_ALLOCATION;
-    Element mElement_SAMPLER;
-    Element mElement_SCRIPT;
-    Element mElement_MESH;
-    Element mElement_PROGRAM_FRAGMENT;
-    Element mElement_PROGRAM_VERTEX;
-    Element mElement_PROGRAM_RASTER;
-    Element mElement_PROGRAM_STORE;
-    Element mElement_FONT;
+    volatile Element mElement_ELEMENT;
+    volatile Element mElement_TYPE;
+    volatile Element mElement_ALLOCATION;
+    volatile Element mElement_SAMPLER;
+    volatile Element mElement_SCRIPT;
+    volatile Element mElement_MESH;
+    volatile Element mElement_PROGRAM_FRAGMENT;
+    volatile Element mElement_PROGRAM_VERTEX;
+    volatile Element mElement_PROGRAM_RASTER;
+    volatile Element mElement_PROGRAM_STORE;
+    volatile Element mElement_FONT;
 
-    Element mElement_A_8;
-    Element mElement_RGB_565;
-    Element mElement_RGB_888;
-    Element mElement_RGBA_5551;
-    Element mElement_RGBA_4444;
-    Element mElement_RGBA_8888;
+    volatile Element mElement_A_8;
+    volatile Element mElement_RGB_565;
+    volatile Element mElement_RGB_888;
+    volatile Element mElement_RGBA_5551;
+    volatile Element mElement_RGBA_4444;
+    volatile Element mElement_RGBA_8888;
 
-    Element mElement_HALF_2;
-    Element mElement_HALF_3;
-    Element mElement_HALF_4;
+    volatile Element mElement_HALF_2;
+    volatile Element mElement_HALF_3;
+    volatile Element mElement_HALF_4;
 
-    Element mElement_FLOAT_2;
-    Element mElement_FLOAT_3;
-    Element mElement_FLOAT_4;
+    volatile Element mElement_FLOAT_2;
+    volatile Element mElement_FLOAT_3;
+    volatile Element mElement_FLOAT_4;
 
-    Element mElement_DOUBLE_2;
-    Element mElement_DOUBLE_3;
-    Element mElement_DOUBLE_4;
+    volatile Element mElement_DOUBLE_2;
+    volatile Element mElement_DOUBLE_3;
+    volatile Element mElement_DOUBLE_4;
 
-    Element mElement_UCHAR_2;
-    Element mElement_UCHAR_3;
-    Element mElement_UCHAR_4;
+    volatile Element mElement_UCHAR_2;
+    volatile Element mElement_UCHAR_3;
+    volatile Element mElement_UCHAR_4;
 
-    Element mElement_CHAR_2;
-    Element mElement_CHAR_3;
-    Element mElement_CHAR_4;
+    volatile Element mElement_CHAR_2;
+    volatile Element mElement_CHAR_3;
+    volatile Element mElement_CHAR_4;
 
-    Element mElement_USHORT_2;
-    Element mElement_USHORT_3;
-    Element mElement_USHORT_4;
+    volatile Element mElement_USHORT_2;
+    volatile Element mElement_USHORT_3;
+    volatile Element mElement_USHORT_4;
 
-    Element mElement_SHORT_2;
-    Element mElement_SHORT_3;
-    Element mElement_SHORT_4;
+    volatile Element mElement_SHORT_2;
+    volatile Element mElement_SHORT_3;
+    volatile Element mElement_SHORT_4;
 
-    Element mElement_UINT_2;
-    Element mElement_UINT_3;
-    Element mElement_UINT_4;
+    volatile Element mElement_UINT_2;
+    volatile Element mElement_UINT_3;
+    volatile Element mElement_UINT_4;
 
-    Element mElement_INT_2;
-    Element mElement_INT_3;
-    Element mElement_INT_4;
+    volatile Element mElement_INT_2;
+    volatile Element mElement_INT_3;
+    volatile Element mElement_INT_4;
 
-    Element mElement_ULONG_2;
-    Element mElement_ULONG_3;
-    Element mElement_ULONG_4;
+    volatile Element mElement_ULONG_2;
+    volatile Element mElement_ULONG_3;
+    volatile Element mElement_ULONG_4;
 
-    Element mElement_LONG_2;
-    Element mElement_LONG_3;
-    Element mElement_LONG_4;
+    volatile Element mElement_LONG_2;
+    volatile Element mElement_LONG_3;
+    volatile Element mElement_LONG_4;
 
-    Element mElement_YUV;
+    volatile Element mElement_YUV;
 
-    Element mElement_MATRIX_4X4;
-    Element mElement_MATRIX_3X3;
-    Element mElement_MATRIX_2X2;
+    volatile Element mElement_MATRIX_4X4;
+    volatile Element mElement_MATRIX_3X3;
+    volatile Element mElement_MATRIX_2X2;
 
-    Sampler mSampler_CLAMP_NEAREST;
-    Sampler mSampler_CLAMP_LINEAR;
-    Sampler mSampler_CLAMP_LINEAR_MIP_LINEAR;
-    Sampler mSampler_WRAP_NEAREST;
-    Sampler mSampler_WRAP_LINEAR;
-    Sampler mSampler_WRAP_LINEAR_MIP_LINEAR;
-    Sampler mSampler_MIRRORED_REPEAT_NEAREST;
-    Sampler mSampler_MIRRORED_REPEAT_LINEAR;
-    Sampler mSampler_MIRRORED_REPEAT_LINEAR_MIP_LINEAR;
+    volatile Sampler mSampler_CLAMP_NEAREST;
+    volatile Sampler mSampler_CLAMP_LINEAR;
+    volatile Sampler mSampler_CLAMP_LINEAR_MIP_LINEAR;
+    volatile Sampler mSampler_WRAP_NEAREST;
+    volatile Sampler mSampler_WRAP_LINEAR;
+    volatile Sampler mSampler_WRAP_LINEAR_MIP_LINEAR;
+    volatile Sampler mSampler_MIRRORED_REPEAT_NEAREST;
+    volatile Sampler mSampler_MIRRORED_REPEAT_LINEAR;
+    volatile Sampler mSampler_MIRRORED_REPEAT_LINEAR_MIP_LINEAR;
 
     ProgramStore mProgramStore_BLEND_NONE_DEPTH_TEST;
     ProgramStore mProgramStore_BLEND_NONE_DEPTH_NO_DEPTH;