Add most missing blink files to .gn files

third_party/WebKit/Source/modules/webgl/BUILD.gn

 # Copyright 2016 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.
 
 import("//third_party/WebKit/Source/modules/modules.gni")
 
 blink_modules_sources("webgl") {
   sources = [
     "ANGLEInstancedArrays.cpp",
     "ANGLEInstancedArrays.h",
     "EXTBlendMinMax.cpp",
     "EXTBlendMinMax.h",
     "EXTColorBufferFloat.cpp",
     "EXTColorBufferFloat.h",
     "EXTDisjointTimerQuery.cpp",
     "EXTDisjointTimerQuery.h",
     "EXTDisjointTimerQueryWebGL2.cpp",
     "EXTDisjointTimerQueryWebGL2.h",
     "EXTFragDepth.cpp",
     "EXTFragDepth.h",
     "EXTShaderTextureLOD.cpp",
     "EXTShaderTextureLOD.h",
     "EXTTextureFilterAnisotropic.cpp",
     "EXTTextureFilterAnisotropic.h",
     "EXTsRGB.cpp",
     "EXTsRGB.h",
+    "GLStringQuery.h",
     "OESElementIndexUint.cpp",
     "OESElementIndexUint.h",
     "OESStandardDerivatives.cpp",
     "OESStandardDerivatives.h",
     "OESTextureFloat.cpp",
     "OESTextureFloat.h",
     "OESTextureFloatLinear.cpp",
     "OESTextureFloatLinear.h",
     "OESTextureHalfFloat.cpp",
     "OESTextureHalfFloat.h",
@@ skipping 87 matching lines @@
     "WebGLVertexArrayObjectBase.h",
     "WebGLVertexArrayObjectOES.cpp",
     "WebGLVertexArrayObjectOES.h",
   ]
 
   # The modules/webgl/ directly is a larger module, and
   # the implementation depends on a fair chunk of core/ --
   # include the core pch for faster Windows compilation times.
   configs += [ "//third_party/WebKit/Source/core:blink_core_pch" ]
 }