Fix blink side WebGL2 sync object related behaviors.

third_party/WebKit/Source/modules/webgl/WebGL2RenderingContextBase.idl

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-typedef long long      GLint64;
+typedef long long GLint64;
+typedef unsigned long long GLuint64;
 
 [
     RuntimeEnabled=UnsafeES3APIs,
     NoInterfaceObject,
 ] interface WebGL2RenderingContextBase {
     const GLenum READ_BUFFER                                   = 0x0C02;
     const GLenum UNPACK_ROW_LENGTH                             = 0x0CF2;
     const GLenum UNPACK_SKIP_ROWS                              = 0x0CF3;
     const GLenum UNPACK_SKIP_PIXELS                            = 0x0CF4;
     const GLenum PACK_ROW_LENGTH                               = 0x0D02;
@@ skipping 391 matching lines @@
     GLboolean isSampler(WebGLSampler? sampler);
     void bindSampler(GLuint unit, WebGLSampler? sampler);
     void samplerParameteri(WebGLSampler? sampler, GLenum pname, GLint param);
     void samplerParameterf(WebGLSampler? sampler, GLenum pname, GLfloat param);
     [CallWith=ScriptState] any getSamplerParameter(WebGLSampler? sampler, GLenum pname);
 
     /* Sync objects */
     WebGLSync fenceSync(GLenum condition, GLbitfield flags);
     GLboolean isSync(WebGLSync? sync);
     void deleteSync(WebGLSync? sync);
-    GLenum clientWaitSync(WebGLSync? sync, GLbitfield flags, GLint64 timeout);
+    GLenum clientWaitSync(WebGLSync? sync, GLbitfield flags, GLuint64 timeout);
     void waitSync(WebGLSync? sync, GLbitfield flags, GLint64 timeout);
 
     [CallWith=ScriptState] any getSyncParameter(WebGLSync? sync, GLenum pname);
 
     /* Transform Feedback */
     WebGLTransformFeedback createTransformFeedback();
     void deleteTransformFeedback(WebGLTransformFeedback? feedback);
     GLboolean isTransformFeedback(WebGLTransformFeedback? feedback);
     void bindTransformFeedback (GLenum target, WebGLTransformFeedback? feedback);
     void beginTransformFeedback(GLenum primitiveMode);
@@ skipping 17 matching lines @@
     /* Vertex Array Objects */
     WebGLVertexArrayObject createVertexArray();
     void deleteVertexArray(WebGLVertexArrayObject? vertexArray);
     GLboolean isVertexArray(WebGLVertexArrayObject? vertexArray);
     void bindVertexArray(WebGLVertexArrayObject? vertexArray);
 
     /* Reading */
     void readPixels(GLint x, GLint y, GLsizei width, GLsizei height, GLenum format, GLenum type, GLintptr offset);
 };
 WebGL2RenderingContextBase implements WebGLRenderingContextBase;