update getTexParameter for WebGL 2

Source/core/html/canvas/WebGL2RenderingContextBase.h

Index: Source/core/html/canvas/WebGL2RenderingContextBase.h
diff --git a/Source/core/html/canvas/WebGL2RenderingContextBase.h b/Source/core/html/canvas/WebGL2RenderingContextBase.h
index ee7e83362eb7c368e17062bf6de8f0f8ee1f8c1b..b6c926f80513bfbf2e7de5bbec74249aba8e9c82 100644
--- a/Source/core/html/canvas/WebGL2RenderingContextBase.h
+++ b/Source/core/html/canvas/WebGL2RenderingContextBase.h
@@ -159,6 +159,9 @@ public:
     GLboolean isVertexArray(WebGLVertexArrayObjectOES*);
     void bindVertexArray(WebGLVertexArrayObjectOES*);
 
+    /* WebGLRenderingContextBase APIs overrides */
+    ScriptValue getTexParameter(ScriptState*, GLenum target, GLenum pname) override;
+
     DECLARE_VIRTUAL_TRACE();
 
 protected:
@@ -166,9 +169,11 @@ protected:
 
     bool validateClearBuffer(const char* functionName, GLenum buffer, GLsizei length);
 
-    /* WebGLRenderingContextBase overrides */
+    /* WebGLRenderingContextBase helper functions overrides */
     bool validateCapability(const char* functionName, GLenum) override;
     bool validateAndUpdateBufferBindTarget(const char* functionName, GLenum, WebGLBuffer*) override;
+
+    WebGLTexture* validateTextureBinding(const char* functionName, GLenum target, bool useSixEnumsForCubeMap) override;
 };
 
 DEFINE_TYPE_CASTS(WebGL2RenderingContextBase, CanvasRenderingContext, context,