Adding Blink-side support for EXT_shader_texture_lod

Source/core/html/canvas/WebGLRenderingContext.cpp

Index: Source/core/html/canvas/WebGLRenderingContext.cpp
diff --git a/Source/core/html/canvas/WebGLRenderingContext.cpp b/Source/core/html/canvas/WebGLRenderingContext.cpp
index 7d76e25a2198d2df17b1d797334dfcffa8039f66..32055f2e014b038db171222f997ed129283ed2b7 100644
--- a/Source/core/html/canvas/WebGLRenderingContext.cpp
+++ b/Source/core/html/canvas/WebGLRenderingContext.cpp
@@ -29,6 +29,7 @@
 #include "core/frame/LocalFrame.h"
 #include "core/html/canvas/ANGLEInstancedArrays.h"
 #include "core/html/canvas/EXTFragDepth.h"
+#include "core/html/canvas/EXTShaderTextureLOD.h"
 #include "core/html/canvas/EXTTextureFilterAnisotropic.h"
 #include "core/html/canvas/OESElementIndexUint.h"
 #include "core/html/canvas/OESStandardDerivatives.h"
@@ -139,6 +140,7 @@ void WebGLRenderingContext::registerContextExtensions()
 
     // Register draft extensions.
     registerExtension<EXTFragDepth>(m_extFragDepth, DraftExtension);
+    registerExtension<EXTShaderTextureLOD>(m_extShaderTextureLOD, DraftExtension);
 
     // Register privileged extensions.
     registerExtension<WebGLDebugRendererInfo>(m_webglDebugRendererInfo, WebGLDebugRendererInfoExtension);