Allow textures to be moved from one GL context group to another.

third_party/khronos/GLES2/gl2ext.h

Index: third_party/khronos/GLES2/gl2ext.h
===================================================================
--- third_party/khronos/GLES2/gl2ext.h	(revision 133771)
+++ third_party/khronos/GLES2/gl2ext.h	(working copy)
@@ -1982,6 +1982,25 @@
 #define GL_COMMANDS_ISSUED_CHROMIUM 0x84F2
 #endif
 
+/* GL_CHROMIUM_copy_texture */

[Ken Russell (switch to Gerrit), 2012/04/26 01:10:53]

Should be GL_CHROMIUM_texture_mailbox. Also, the mailbox size needs to be
defined in this file somehow. Minimally something like "#define
GL_MAILBOX_SIZE_CHROMIUM 32".

+#ifndef GL_CHROMIUM_copy_texture
+#define GL_CHROMIUM_copy_texture 1
+#ifdef GL_GLEXT_PROTOTYPES
+#define glGenMailboxCHROMIUM GLES2_GET_FUN(GenMailboxCHROMIUM)
+#define glProduceTextureCHROMIUM GLES2_GET_FUN(ProduceTextureCHROMIUM)
+#define glConsumeTextureCHROMIUM GLES2_GET_FUN(ConsumeTextureCHROMIUM)
+#if !defined(GLES2_USE_CPP_BINDINGS)
+GL_APICALL void GL_APIENTRY glGenMailboxCHROMIUM (char* mailbox);
+GL_APICALL void GL_APIENTRY glProduceTextureCHROMIUM (GLenum target, const char* mailbox);
+GL_APICALL void GL_APIENTRY glConsumeTextureCHROMIUM (GLenum target, const  char* mailbox);
+#endif
+#else
+typedef void (GL_APIENTRYP PFNGLGENMAILBOXCHROMIUM) (char* mailbox);
+typedef void (GL_APIENTRYP PFNGLPRODUCETEXTURECHROMIUM) (GLenum target, const char* mailbox);
+typedef void (GL_APIENTRYP PFNGLCONSUMETEXTURECHROMIUM) (GLenum target, const  char* mailbox);
+#endif
+#endif
+
 #ifdef __cplusplus
 }
 #endif