Fix low risk trivial non-nullable =>nullable idl mismatch in WebGL2RenderingContextBase.idl

third_party/WebKit/Source/modules/webgl/WebGL2RenderingContextBase.idl

Index: third_party/WebKit/Source/modules/webgl/WebGL2RenderingContextBase.idl
diff --git a/third_party/WebKit/Source/modules/webgl/WebGL2RenderingContextBase.idl b/third_party/WebKit/Source/modules/webgl/WebGL2RenderingContextBase.idl
index 45c6d0d72c4f368e4e04ec5717e7931da491cccd..1a1bc79eac24b16570c7a1704eb54839bd4c6c17 100644
--- a/third_party/WebKit/Source/modules/webgl/WebGL2RenderingContextBase.idl
+++ b/third_party/WebKit/Source/modules/webgl/WebGL2RenderingContextBase.idl
@@ -391,7 +391,7 @@ typedef unsigned long long GLuint64;
     void clearBufferfi(GLenum buffer, GLint drawbuffer, GLfloat depth, GLint stencil);
 
     /* Query Objects */
-    WebGLQuery createQuery();
+    WebGLQuery? createQuery();
     void deleteQuery(WebGLQuery? query);
     GLboolean isQuery(WebGLQuery? query);
     void beginQuery(GLenum target, WebGLQuery query);
@@ -400,7 +400,7 @@ typedef unsigned long long GLuint64;
     [CallWith=ScriptState] any getQueryParameter(WebGLQuery query, GLenum pname);
 
     /* Sampler Objects */
-    WebGLSampler createSampler();
+    WebGLSampler? createSampler();
     void deleteSampler(WebGLSampler? sampler);
     GLboolean isSampler(WebGLSampler? sampler);
     void bindSampler(GLuint unit, WebGLSampler? sampler);
@@ -409,7 +409,7 @@ typedef unsigned long long GLuint64;
     [CallWith=ScriptState] any getSamplerParameter(WebGLSampler sampler, GLenum pname);
 
     /* Sync objects */
-    WebGLSync fenceSync(GLenum condition, GLbitfield flags);
+    WebGLSync? fenceSync(GLenum condition, GLbitfield flags);
     GLboolean isSync(WebGLSync? sync);
     void deleteSync(WebGLSync? sync);
     GLenum clientWaitSync(WebGLSync sync, GLbitfield flags, GLuint64 timeout);
@@ -418,14 +418,14 @@ typedef unsigned long long GLuint64;
     [CallWith=ScriptState] any getSyncParameter(WebGLSync sync, GLenum pname);
 
     /* Transform Feedback */
-    WebGLTransformFeedback createTransformFeedback();
+    WebGLTransformFeedback? createTransformFeedback();
     void deleteTransformFeedback(WebGLTransformFeedback? feedback);
     GLboolean isTransformFeedback(WebGLTransformFeedback? feedback);
     void bindTransformFeedback(GLenum target, WebGLTransformFeedback? feedback);
     void beginTransformFeedback(GLenum primitiveMode);
     void endTransformFeedback();
     void transformFeedbackVaryings(WebGLProgram program, sequence<DOMString> varyings, GLenum bufferMode);
-    WebGLActiveInfo getTransformFeedbackVarying(WebGLProgram program, GLuint index);
+    WebGLActiveInfo? getTransformFeedbackVarying(WebGLProgram program, GLuint index);
     void pauseTransformFeedback();
     void resumeTransformFeedback();
 
@@ -441,7 +441,7 @@ typedef unsigned long long GLuint64;
     void uniformBlockBinding(WebGLProgram program, GLuint uniformBlockIndex, GLuint uniformBlockBinding);
 
     /* Vertex Array Objects */
-    WebGLVertexArrayObject createVertexArray();
+    WebGLVertexArrayObject? createVertexArray();
     void deleteVertexArray(WebGLVertexArrayObject? vertexArray);
     GLboolean isVertexArray(WebGLVertexArrayObject? vertexArray);
     void bindVertexArray(WebGLVertexArrayObject? vertexArray);