WebGL functions returning strings should not return null

content/renderer/gpu/webgraphicscontext3d_command_buffer_impl.cc

 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #if defined(ENABLE_GPU)
 
 #include "content/renderer/gpu/webgraphicscontext3d_command_buffer_impl.h"
 
 #include "gpu/GLES2/gl2.h"
 #ifndef GL_GLEXT_PROTOTYPES
@@ skipping 693 matching lines @@
 
 DELEGATE_TO_GL_2(getIntegerv, GetIntegerv, WGC3Denum, WGC3Dint*)
 
 DELEGATE_TO_GL_3(getProgramiv, GetProgramiv, WebGLId, WGC3Denum, WGC3Dint*)
 
 WebKit::WebString WebGraphicsContext3DCommandBufferImpl::getProgramInfoLog(
     WebGLId program) {
   GLint logLength = 0;
   gl_->GetProgramiv(program, GL_INFO_LOG_LENGTH, &logLength);
   if (!logLength)
-    return WebKit::WebString();
+    return WebKit::WebString("");
   scoped_array<GLchar> log(new GLchar[logLength]);
   if (!log.get())
-    return WebKit::WebString();
+    return WebKit::WebString("");
   GLsizei returnedLogLength = 0;
   gl_->GetProgramInfoLog(
       program, logLength, &returnedLogLength, log.get());
   DCHECK_EQ(logLength, returnedLogLength + 1);
   WebKit::WebString res =
       WebKit::WebString::fromUTF8(log.get(), returnedLogLength);
   return res;
 }
 
 DELEGATE_TO_GL_3(getRenderbufferParameteriv, GetRenderbufferParameteriv,
                  WGC3Denum, WGC3Denum, WGC3Dint*)
 
 DELEGATE_TO_GL_3(getShaderiv, GetShaderiv, WebGLId, WGC3Denum, WGC3Dint*)
 
 WebKit::WebString WebGraphicsContext3DCommandBufferImpl::getShaderInfoLog(
     WebGLId shader) {
   GLint logLength = 0;
   gl_->GetShaderiv(shader, GL_INFO_LOG_LENGTH, &logLength);
   if (!logLength)
-    return WebKit::WebString();
+    return WebKit::WebString("");
   scoped_array<GLchar> log(new GLchar[logLength]);
   if (!log.get())
-    return WebKit::WebString();
+    return WebKit::WebString("");
   GLsizei returnedLogLength = 0;
   gl_->GetShaderInfoLog(
       shader, logLength, &returnedLogLength, log.get());
   DCHECK_EQ(logLength, returnedLogLength + 1);
   WebKit::WebString res =
       WebKit::WebString::fromUTF8(log.get(), returnedLogLength);
   return res;
 }
 
 WebKit::WebString WebGraphicsContext3DCommandBufferImpl::getShaderSource(
@@ skipping 339 matching lines @@
   }
 #ifndef WTF_USE_THREADED_COMPOSITING
   RenderView* renderview =
       web_view_ ? RenderView::FromWebView(web_view_) : NULL;
   if (renderview)
     renderview->OnViewContextSwapBuffersAborted();
 #endif
 }
 
 #endif  // defined(ENABLE_GPU)