Reland of Upgrade PixelStorei to ES3/WebGL2.

third_party/WebKit/Source/modules/webgl/WebGLRenderingContextBase.h

Index: third_party/WebKit/Source/modules/webgl/WebGLRenderingContextBase.h
diff --git a/third_party/WebKit/Source/modules/webgl/WebGLRenderingContextBase.h b/third_party/WebKit/Source/modules/webgl/WebGLRenderingContextBase.h
index 201fc75d60efc86e33b35d98178ec48df7cc61e8..c2862a954697e80628f8a35fab27ea1fcceca87e 100644
--- a/third_party/WebKit/Source/modules/webgl/WebGLRenderingContextBase.h
+++ b/third_party/WebKit/Source/modules/webgl/WebGLRenderingContextBase.h
@@ -276,7 +276,7 @@
 
     void lineWidth(GLfloat);
     void linkProgram(WebGLProgram*);
-    void pixelStorei(GLenum pname, GLint param);
+    virtual void pixelStorei(GLenum pname, GLint param);
     void polygonOffset(GLfloat factor, GLfloat units);
     virtual void readPixels(GLint x, GLint y, GLsizei width, GLsizei height, GLenum format, GLenum type, DOMArrayBufferView* pixels);
     void renderbufferStorage(GLenum target, GLenum internalformat, GLsizei width, GLsizei height);
@@ -487,6 +487,11 @@
     void addCompressedTextureFormat(GLenum);
     void removeAllCompressedTextureFormats();
 
+    // Set UNPACK_ALIGNMENT to 1, all other parameters to 0.
+    virtual void resetUnpackParameters();
+    // Restore the client unpack parameters.
+    virtual void restoreUnpackParameters();
+
     PassRefPtr<Image> drawImageIntoBuffer(PassRefPtr<Image>, int width, int height, const char* functionName);
 
     PassRefPtr<Image> videoFrameToImage(HTMLVideoElement*);