Bug 1170855 - Part 7: Implement MAX_CLIENT_WAIT_TIMEOUT_WEBGL. r=jgilbert, r=smaug

This is a special addition for WebGL 2. I've updated webidl to match the
spec.

I've set the value to be 0 to match Chrome. If I query the underlying
GL, I get -1 back. (On OSX). We can discuss what a better value would
be.

dom/canvas/WebGL2ContextState.cpp

@@ -75,7 +75,9 @@ WebGL2Context::GetParameter(JSContext* cx, GLenum pname, ErrorResult& rv)
     }
 
     /* GLint64 */
-    //case LOCAL_GL_MAX_CLIENT_WAIT_TIMEOUT_WEBGL:
+    case LOCAL_GL_MAX_CLIENT_WAIT_TIMEOUT_WEBGL:
+      return JS::NumberValue(0); // TODO
+
     case LOCAL_GL_MAX_ELEMENT_INDEX:
     case LOCAL_GL_MAX_COMBINED_FRAGMENT_UNIFORM_COMPONENTS:
     case LOCAL_GL_MAX_COMBINED_VERTEX_UNIFORM_COMPONENTS:

dom/webidl/WebGL2RenderingContext.webidl

@@ -310,7 +310,10 @@ interface WebGL2RenderingContext : WebGLRenderingContext
     const GLenum NUM_SAMPLE_COUNTS                             = 0x9380;
     const GLenum TEXTURE_IMMUTABLE_LEVELS                      = 0x82DF;
 
-    const GLint64 TIMEOUT_IGNORED                              = -1;
+    const GLuint64 TIMEOUT_IGNORED                             = 0xFFFFFFFFFFFFFFFF;
+
+    /* WebGL-specific enums */
+    const GLenum MAX_CLIENT_WAIT_TIMEOUT_WEBGL                 = 0x9247;
 
     /* Buffer objects */
     void copyBufferSubData(GLenum readTarget, GLenum writeTarget, GLintptr readOffset,

gfx/gl/GLConsts.h

@@ -2279,6 +2279,7 @@
 #define LOCAL_GL_MAX_ATTRIB_STACK_DEPTH                      0x0D35
 #define LOCAL_GL_MAX_BINDABLE_UNIFORM_SIZE_EXT               0x8DED
 #define LOCAL_GL_MAX_CLIENT_ATTRIB_STACK_DEPTH               0x0D3B
+#define LOCAL_GL_MAX_CLIENT_WAIT_TIMEOUT_WEBGL               0x9247
 #define LOCAL_GL_MAX_CLIPMAP_DEPTH_SGIX                      0x8177
 #define LOCAL_GL_MAX_CLIPMAP_VIRTUAL_DEPTH_SGIX              0x8178
 #define LOCAL_GL_MAX_CLIP_DISTANCES                          0x0D32