Support line-continuation character in WebGL 2.0

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 57579e741404c5e8e9d58145cc393eee6389f5e9..a78cbf82e0ff00bf5530292b8155f3006eb8d47b 100644
--- a/third_party/WebKit/Source/modules/webgl/WebGLRenderingContextBase.h
+++ b/third_party/WebKit/Source/modules/webgl/WebGLRenderingContextBase.h
@@ -819,6 +819,11 @@ protected:
     // ASCII subset as defined in GLSL ES 1.0 spec section 3.1.
     bool validateString(const char* functionName, const String&);
 
+    // Helper function to check if all characters in the shader source belong to the ASCII
+    // subset as defined in GLSL ES 1.0 spec section 3.1 Character Set for WebGL 1.0 and
+    // in GLSL ES 3.00 spec section 3.1 Character Set for WebGL 2.0.
+    bool validateShaderSource(const String&);
+
     // Helper function to check texture binding target and texture bound to the target.
     // Generate GL errors and return 0 if target is invalid or texture bound is
     // null.  Otherwise, return the texture bound to the target.