Implement --use-gl=any

ui/gfx/gl/gl_implementation.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.
 
 #include "ui/gfx/gl/gl_implementation.h"
 
 #include <algorithm>
 #include <string>
 
 #include "base/at_exit.h"
@@ skipping 47 matching lines @@
       return kGLImplementationNamePairs[i].name;
   }
 
   return "unknown";
 }
 
 bool InitializeRequestedGLBindings(
     const GLImplementation* allowed_implementations_begin,
     const GLImplementation* allowed_implementations_end,
     GLImplementation default_implementation) {
+  bool fallback_to_osmesa = false;
   if (CommandLine::ForCurrentProcess()->HasSwitch(switches::kUseGL)) {
     std::string requested_implementation_name =
         CommandLine::ForCurrentProcess()->GetSwitchValueASCII(switches::kUseGL);
-    GLImplementation requested_implementation =
+    GLImplementation requested_implementation;
+    if (requested_implementation_name == "any") {
+      requested_implementation = default_implementation;
+      fallback_to_osmesa = true;
+    } else {
+      requested_implementation =
         GetNamedGLImplementation(requested_implementation_name);
+    }
     if (std::find(allowed_implementations_begin,
                   allowed_implementations_end,
                   requested_implementation) == allowed_implementations_end) {
       LOG(ERROR) << "Requested GL implementation is not available.";
       return false;
     }
 
     InitializeGLBindings(requested_implementation);
   } else {
     InitializeGLBindings(default_implementation);
   }
 
+  if (GetGLImplementation() == kGLImplementationNone && fallback_to_osmesa)
+    InitializeGLBindings(kGLImplementationOSMesaGL);
+
   if (CommandLine::ForCurrentProcess()->HasSwitch(
       switches::kEnableGPUServiceLogging)) {
     InitializeDebugGLBindings();
   }
 
   if (GetGLImplementation() == kGLImplementationNone) {
     LOG(ERROR) << "Could not initialize GL.";
     return false;
   } else {
     LOG(INFO) << "Using "
@@ skipping 47 matching lines @@
   if (g_get_proc_address) {
     void* proc = g_get_proc_address(name);
     if (proc)
       return proc;
   }
 
   return NULL;
 }
 
 }  // namespace gfx