Bug 1378474 - part 1 - centralize AvailableRunnable dispatching; r=jgilbert

This change will make labeling AvailableRunnable simpler, as we'll only
have to modify one location.

dom/canvas/WebGLQuery.cpp

@@ -61,6 +61,12 @@ WebGLQuery::Delete()
     LinkedListElement<WebGLQuery>::removeFrom(mContext->mQueries);
 }
 
+static void
+DispatchAvailableRunnable(WebGLQuery* query)
+{
+    NS_DispatchToCurrentThread(new AvailableRunnable(query));
+}
+
 ////
 
 static GLenum
@@ -126,7 +132,7 @@ WebGLQuery::EndQuery()
 
     ////
 
-    NS_DispatchToCurrentThread(new AvailableRunnable(this));
+    DispatchAvailableRunnable(this);
 }
 
 void
@@ -254,7 +260,7 @@ WebGLQuery::QueryCounter(const char* funcName, GLenum target)
     gl->MakeCurrent();
     gl->fQueryCounter(mGLName, mTarget);
 
-    NS_DispatchToCurrentThread(new AvailableRunnable(this));
+    DispatchAvailableRunnable(this);
 }
 
 ////