Expose the CLD data source in chrome://translate-internals

components/translate/content/renderer/data_file_renderer_cld_data_provider.cc

 // Copyright 2014 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 "data_file_renderer_cld_data_provider.h"
 
 #include "base/basictypes.h"
 #include "base/files/file.h"
 #include "base/files/memory_mapped_file.h"
 #include "base/lazy_instance.h"
+#include "base/logging.h"
 #include "components/translate/content/common/data_file_cld_data_provider_messages.h"
 #include "content/public/renderer/render_view_observer.h"
 #include "ipc/ipc_message.h"
 #include "ipc/ipc_message_macros.h"
 #include "ipc/ipc_platform_file.h"
 #include "third_party/cld_2/src/public/compact_lang_det.h"
 
 namespace {
 
 // A struct that contains the pointer to the CLD mmap. Used so that we can
 // leverage LazyInstance:Leaky to properly scope the lifetime of the mmap.
 struct CLDMmapWrapper {
   CLDMmapWrapper() { value = NULL; }
   base::MemoryMappedFile* value;
 };
 base::LazyInstance<CLDMmapWrapper>::Leaky g_cld_mmap =
     LAZY_INSTANCE_INITIALIZER;
 
 }  // namespace
 
 namespace translate {
 
 // Implementation of the static factory method from RendererCldDataProvider,
 // hooking up this specific implementation for all of Chromium.
 RendererCldDataProvider* CreateRendererCldDataProviderFor(
     content::RenderViewObserver* render_view_observer) {
+  // This log line is to help with determining which kind of provider has been
+  // configured. See also: chrome://translate-internals
+  VLOG(1) << "Creating DataFileRendererCldDataProvider";
   return new DataFileRendererCldDataProvider(render_view_observer);
 }
 
 DataFileRendererCldDataProvider::DataFileRendererCldDataProvider(
     content::RenderViewObserver* render_view_observer)
     : render_view_observer_(render_view_observer) {
 }
 
 DataFileRendererCldDataProvider::~DataFileRendererCldDataProvider() {
 }
@@ skipping 71 matching lines @@
   // Initialize the CLD subsystem... and it's all done!
   const uint8* data_ptr = g_cld_mmap.Get().value->data() + data_offset;
   CLD2::loadDataFromRawAddress(data_ptr, data_length);
   DCHECK(CLD2::isDataLoaded()) << "Failed to load CLD data from mmap";
   if (!cld_available_callback_.is_null()) {
     cld_available_callback_.Run();
   }
 }
 
 }  // namespace translate