Revert of Add transfer buffer support.

src/gpu/gl/SkNullGLContext.cpp

Index: src/gpu/gl/SkNullGLContext.cpp
diff --git a/src/gpu/gl/SkNullGLContext.cpp b/src/gpu/gl/SkNullGLContext.cpp
index e7270c32c47c6283f5d45e4f2be40bb520a0abda..e2a80ce2b37e72ca6f2c68c85f9a00090c6477b0 100644
--- a/src/gpu/gl/SkNullGLContext.cpp
+++ b/src/gpu/gl/SkNullGLContext.cpp
@@ -122,8 +122,6 @@
     BufferManager   fBufferManager;
     GrGLuint        fCurrArrayBuffer;
     GrGLuint        fCurrElementArrayBuffer;
-    GrGLuint        fCurrPixelPackBuffer;
-    GrGLuint        fCurrPixelUnpackBuffer;
     GrGLuint        fCurrProgramID;
     GrGLuint        fCurrShaderID;
 
@@ -131,8 +129,6 @@
     ContextState()
         : fCurrArrayBuffer(0)
         , fCurrElementArrayBuffer(0)
-        , fCurrPixelPackBuffer(0)
-        , fCurrPixelUnpackBuffer(0)
         , fCurrProgramID(0)
         , fCurrShaderID(0) {}
 
@@ -175,12 +171,6 @@
         break;
     case GR_GL_ELEMENT_ARRAY_BUFFER:
         id = state->fCurrElementArrayBuffer;
-        break;
-    case GR_GL_PIXEL_PACK_BUFFER:
-        id = state->fCurrPixelPackBuffer;
-        break;
-    case GR_GL_PIXEL_UNPACK_BUFFER:
-        id = state->fCurrPixelUnpackBuffer;
         break;
     default:
         SkFAIL("Unexpected target to nullGLBufferData");
@@ -225,12 +215,6 @@
     case GR_GL_ELEMENT_ARRAY_BUFFER:
         state->fCurrElementArrayBuffer = buffer;
         break;
-    case GR_GL_PIXEL_PACK_BUFFER:
-        state->fCurrPixelPackBuffer = buffer;
-        break;
-    case GR_GL_PIXEL_UNPACK_BUFFER:
-        state->fCurrPixelUnpackBuffer = buffer;
-        break;
     }
 }
 
@@ -243,12 +227,6 @@
         }
         if (ids[i] == state->fCurrElementArrayBuffer) {
             state->fCurrElementArrayBuffer = 0;
-        }
-        if (ids[i] == state->fCurrPixelPackBuffer) {
-            state->fCurrPixelPackBuffer = 0;
-        }
-        if (ids[i] == state->fCurrPixelUnpackBuffer) {
-            state->fCurrPixelUnpackBuffer = 0;
         }
 
         BufferObj* buffer = state->fBufferManager.lookUp(ids[i]);
@@ -267,12 +245,6 @@
         case GR_GL_ELEMENT_ARRAY_BUFFER:
             id = state->fCurrElementArrayBuffer;
             break;
-        case GR_GL_PIXEL_PACK_BUFFER:
-            id = state->fCurrPixelPackBuffer;
-            break;
-        case GR_GL_PIXEL_UNPACK_BUFFER:
-            id = state->fCurrPixelUnpackBuffer;
-            break;
     }
 
     if (id > 0) {
@@ -295,12 +267,6 @@
         case GR_GL_ELEMENT_ARRAY_BUFFER:
             id = state->fCurrElementArrayBuffer;
             break;
-        case GR_GL_PIXEL_PACK_BUFFER:
-            id = state->fCurrPixelPackBuffer;
-            break;
-        case GR_GL_PIXEL_UNPACK_BUFFER:
-            id = state->fCurrPixelUnpackBuffer;
-            break;
     }
 
     if (id > 0) {
@@ -328,12 +294,6 @@
         break;
     case GR_GL_ELEMENT_ARRAY_BUFFER:
         id = state->fCurrElementArrayBuffer;
-        break;
-    case GR_GL_PIXEL_PACK_BUFFER:
-        id = state->fCurrPixelPackBuffer;
-        break;
-    case GR_GL_PIXEL_UNPACK_BUFFER:
-        id = state->fCurrPixelUnpackBuffer;
         break;
     }
     if (id > 0) {
@@ -359,12 +319,6 @@
                     break;
                 case GR_GL_ELEMENT_ARRAY_BUFFER:
                     id = state->fCurrElementArrayBuffer;
-                    break;
-                case GR_GL_PIXEL_PACK_BUFFER:
-                    id = state->fCurrPixelPackBuffer;
-                    break;
-                case GR_GL_PIXEL_UNPACK_BUFFER:
-                    id = state->fCurrPixelUnpackBuffer;
                     break;
             }
             if (id > 0) {