Modularize Compact Language Detector 2 (CLD2) data sources

chrome/renderer/translate/translate_helper.h

Index: chrome/renderer/translate/translate_helper.h
diff --git a/chrome/renderer/translate/translate_helper.h b/chrome/renderer/translate/translate_helper.h
index febf6af2f834756bf54af0ea23693d1426917603..e78ee8a79f8bb3078febbc9adbd444d8d204a237 100644
--- a/chrome/renderer/translate/translate_helper.h
+++ b/chrome/renderer/translate/translate_helper.h
@@ -8,25 +8,24 @@
 #include <string>
 
 #include "base/gtest_prod_util.h"
+#include "base/memory/scoped_ptr.h"
 #include "base/memory/weak_ptr.h"
 #include "base/strings/string16.h"
 #include "base/time/time.h"
+#include "components/translate/content/renderer/renderer_cld_data_provider.h"
 #include "components/translate/core/common/translate_errors.h"
 #include "content/public/renderer/render_view_observer.h"
-
-#if defined(CLD2_DYNAMIC_MODE)
-#include "base/files/file.h"
-#include "base/files/memory_mapped_file.h"
-#include "base/lazy_instance.h"
-#include "ipc/ipc_platform_file.h"
 #include "url/gurl.h"
-#endif
 
 namespace blink {
 class WebDocument;
 class WebFrame;
 }
 
+namespace content {
+class RendererCldDataProvider;
+}
+
 // This class deals with page translation.
 // There is one TranslateHelper per RenderView.
 
@@ -146,6 +145,25 @@ class TranslateHelper : public content::RenderViewObserver {
   // if the page is being closed.
   blink::WebFrame* GetMainFrame();
 
+  // Do not ask for CLD data any more.
+  void CancelCldDataPolling();
+
+  // Invoked when PageCaptured is called prior to obtaining CLD data. This
+  // method stores the page ID into deferred_page_id_ and COPIES the contents
+  // of the page, then sets deferred_page_capture_ to true. When CLD data is
+  // eventually received (in OnCldDataAvailable), any deferred request will be
+  // "resurrected" and allowed to proceed automatically, assuming that the
+  // page ID has not changed.
+  void DeferPageCaptured(const int page_id, const base::string16& contents);
+
+  // Start polling for CLD data.
+  // Polling will automatically halt as soon as the renderer obtains a
+  // reference to the data file.
+  void SendCldDataRequest(const int delay_millis, const int next_delay_millis);
+
+  // Callback triggered when CLD data becomes available.
+  void OnCldDataAvailable();
+
   // ID to represent a page which TranslateHelper captured and determined a
   // content language.
   int page_id_;
@@ -162,57 +180,14 @@ class TranslateHelper : public content::RenderViewObserver {
   // Method factory used to make calls to TranslatePageImpl.
   base::WeakPtrFactory<TranslateHelper> weak_method_factory_;
 
-#if defined(CLD2_DYNAMIC_MODE)
-  // Do not ask for CLD data any more.
-  void CancelCLD2DataFilePolling();
-
-  // Invoked when PageCaptured is called prior to obtaining CLD data. This
-  // method stores the page ID into deferred_page_id_ and COPIES the contents
-  // of the page, then sets deferred_page_capture_ to true. When CLD data is
-  // eventually received (in OnCLDDataAvailable), any deferred request will be
-  // "resurrected" and allowed to proceed automatically, assuming that the
-  // page ID has not changed.
-  void DeferPageCaptured(const int page_id, const base::string16& contents);
-
-  // Immediately send an IPC request to the browser process to get the CLD
-  // data file. In most cases, the file will already exist and we will only
-  // poll once; but since the file might need to be downloaded first, poll
-  // indefinitely until a ChromeViewMsg_CLDDataAvailable message is received
-  // from the browser process.
-  // Polling will automatically halt as soon as the renderer obtains a
-  // reference to the data file.
-  void SendCLD2DataFileRequest(const int delay_millis,
-                               const int next_delay_millis);
-
-  // Invoked when a ChromeViewMsg_CLDDataAvailable message is received from
-  // the browser process, providing a file handle for the CLD data file. If a
-  // PageCaptured request was previously deferred with DeferPageCaptured and
-  // the page ID has not yet changed, the PageCaptured is reinvoked to
-  // "resurrect" the language detection pathway.
-  void OnCLDDataAvailable(const IPC::PlatformFileForTransit ipc_file_handle,
-                          const uint64 data_offset,
-                          const uint64 data_length);
-
-  // After receiving data in OnCLDDataAvailable, loads the data into CLD2.
-  void LoadCLDDData(base::File file,
-                    const uint64 data_offset,
-                    const uint64 data_length);
-
-  // 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;
-  };
-  static base::LazyInstance<CLDMmapWrapper>::Leaky s_cld_mmap_;
+  // Provides CLD data for this process.
+  scoped_ptr<translate::RendererCldDataProvider> cld_data_provider_;
 
   // Whether or not polling for CLD2 data has started.
-  bool cld2_data_file_polling_started_;
+  bool cld_data_polling_started_;
 
-  // Whether or not CancelCLD2DataFilePolling has been called.
-  bool cld2_data_file_polling_canceled_;
+  // Whether or not CancelCldDataPolling has been called.
+  bool cld_data_polling_canceled_;
 
   // Whether or not a PageCaptured event arrived prior to CLD data becoming
   // available. If true, deferred_page_id_ contains the most recent page ID
@@ -227,8 +202,6 @@ class TranslateHelper : public content::RenderViewObserver {
   // deferred_page_capture_ is true.
   base::string16 deferred_contents_;
 
-#endif
-
   DISALLOW_COPY_AND_ASSIGN(TranslateHelper);
 };