Implement OES_texture_float_linear and OES_texture_half_float_linear extensions in WebGL.

Source/core/html/canvas/WebGLRenderingContext.h

Index: Source/core/html/canvas/WebGLRenderingContext.h
diff --git a/Source/core/html/canvas/WebGLRenderingContext.h b/Source/core/html/canvas/WebGLRenderingContext.h
index 5314306c138a2396bd33bbcb2c1fd2d21cfa6209..04269b1c394ede037cf02e4257a9f5504120d3a3 100644
--- a/Source/core/html/canvas/WebGLRenderingContext.h
+++ b/Source/core/html/canvas/WebGLRenderingContext.h
@@ -52,6 +52,8 @@ class IntSize;
 class OESStandardDerivatives;
 class OESTextureFloat;
 class OESTextureHalfFloat;
+class OESTextureFloatLinear;
+class OESTextureHalfFloatLinear;
 class OESVertexArrayObject;
 class OESElementIndexUint;
 class WebGLActiveInfo;
@@ -518,7 +520,9 @@ public:
     OwnPtr<EXTDrawBuffers> m_extDrawBuffers;
     OwnPtr<EXTTextureFilterAnisotropic> m_extTextureFilterAnisotropic;
     OwnPtr<OESTextureFloat> m_oesTextureFloat;
+    OwnPtr<OESTextureFloatLinear> m_oesTextureFloatLinear;
     OwnPtr<OESTextureHalfFloat> m_oesTextureHalfFloat;
+    OwnPtr<OESTextureHalfFloatLinear> m_oesTextureHalfFloatLinear;
     OwnPtr<OESStandardDerivatives> m_oesStandardDerivatives;
     OwnPtr<OESVertexArrayObject> m_oesVertexArrayObject;
     OwnPtr<OESElementIndexUint> m_oesElementIndexUint;
@@ -555,8 +559,7 @@ public:
     void texSubImage2DBase(GC3Denum target, GC3Dint level, GC3Dint xoffset, GC3Dint yoffset, GC3Dsizei width, GC3Dsizei height, GC3Denum format, GC3Denum type, const void* pixels, ExceptionCode&);
     void texSubImage2DImpl(GC3Denum target, GC3Dint level, GC3Dint xoffset, GC3Dint yoffset, GC3Denum format, GC3Denum type, Image*, GraphicsContext3D::ImageHtmlDomSource, bool flipY, bool premultiplyAlpha, ExceptionCode&);
 
-    void handleNPOTTextures(const char*, bool);
-
+    void handleTexturesCompleteness(const char*, bool);

[Ken Russell (switch to Gerrit), 2013/05/13 20:00:35]

Grammar: handleTextureCompleteness.

     void createFallbackBlackTextures1x1();
 
     // Helper function for copyTex{Sub}Image, check whether the internalformat