Avoid pixel GPU readback in saveLayerWithPickup

src/gpu/gl/GrGLDefines.h

 /*
  * Copyright 2011 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 
 
 #ifndef GrGLDefines_DEFINED
@@ skipping 802 matching lines @@
 #define GR_GL_COLOR_ATTACHMENT0              0x8CE0
 #define GR_GL_DEPTH_ATTACHMENT               0x8D00
 #define GR_GL_STENCIL_ATTACHMENT             0x8D20
 
 // GL_EXT_discard_framebuffer
 #define GR_GL_COLOR                          0x1800
 #define GR_GL_DEPTH                          0x1801
 #define GR_GL_STENCIL                        0x1802
 
 #define GR_GL_NONE                           0
+#define GR_GL_FRAMEBUFFER_DEFAULT            0x8218
 
 #define GR_GL_FRAMEBUFFER_COMPLETE                      0x8CD5
 #define GR_GL_FRAMEBUFFER_INCOMPLETE_ATTACHMENT         0x8CD6
 #define GR_GL_FRAMEBUFFER_INCOMPLETE_MISSING_ATTACHMENT 0x8CD7
 #define GR_GL_FRAMEBUFFER_INCOMPLETE_DIMENSIONS         0x8CD9
 #define GR_GL_FRAMEBUFFER_UNSUPPORTED                   0x8CDD
 
 #define GR_GL_FRAMEBUFFER_BINDING            0x8CA6
 #define GR_GL_RENDERBUFFER_BINDING           0x8CA7
 #define GR_GL_MAX_RENDERBUFFER_SIZE          0x84E8
@@ skipping 110 matching lines @@
 #define GR_EGL_EXTENSIONS                                   0x3055
 #define GR_EGL_GL_TEXTURE_2D                                0x30B1
 #define GR_EGL_GL_TEXTURE_LEVEL                             0x30BC
 #define GR_EGL_IMAGE_PRESERVED                              0x30D2
 #define GR_EGL_FALSE                                        0x0
 #define GR_EGL_TRUE                                         0x1
 #define GR_EGL_NONE                                         0x3038
 #define GR_EGL_NO_IMAGE                                    ((GrEGLImage)0)
 
 #endif