Make MetricsService save compressed logs to local state.

components/metrics/net/net_metrics_log_uploader.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 "components/metrics/net/net_metrics_log_uploader.h"
 
 #include "base/metrics/histogram.h"
-#include "components/metrics/net/compression_utils.h"
 #include "net/base/load_flags.h"
 #include "net/url_request/url_fetcher.h"
 #include "url/gurl.h"
 
 namespace metrics {
 
 NetMetricsLogUploader::NetMetricsLogUploader(
     net::URLRequestContextGetter* request_context_getter,
     const std::string& server_url,
     const std::string& mime_type,
     const base::Callback<void(int)>& on_upload_complete)
     : MetricsLogUploader(server_url, mime_type, on_upload_complete),
       request_context_getter_(request_context_getter) {
 }
 
 NetMetricsLogUploader::~NetMetricsLogUploader() {
 }
 
-bool NetMetricsLogUploader::UploadLog(const std::string& log_data,
+bool NetMetricsLogUploader::UploadLog(const std::string& compressed_log_data,
                                       const std::string& log_hash) {
-  std::string compressed_log_data;
-  if (!GzipCompress(log_data, &compressed_log_data)) {
-    NOTREACHED();
-    return false;
-  }
-
-  UMA_HISTOGRAM_PERCENTAGE(
-      "UMA.ProtoCompressionRatio",
-      static_cast<int>(100 * compressed_log_data.size() / log_data.size()));
-  UMA_HISTOGRAM_CUSTOM_COUNTS(
-      "UMA.ProtoGzippedKBSaved",
-      static_cast<int>((log_data.size() - compressed_log_data.size()) / 1024),
-      1, 2000, 50);
-
   current_fetch_.reset(
       net::URLFetcher::Create(GURL(server_url_), net::URLFetcher::POST, this));
   current_fetch_->SetRequestContext(request_context_getter_);
   current_fetch_->SetUploadData(mime_type_, compressed_log_data);
 
   // Tell the server that we're uploading gzipped protobufs.
   current_fetch_->SetExtraRequestHeaders("content-encoding: gzip");
 
   DCHECK(!log_hash.empty());
   current_fetch_->AddExtraRequestHeader("X-Chrome-UMA-Log-SHA1: " + log_hash);
@@ skipping 13 matching lines @@
   DCHECK_EQ(current_fetch_.get(), source);
 
   int response_code = source->GetResponseCode();
   if (response_code == net::URLFetcher::RESPONSE_CODE_INVALID)
     response_code = -1;
   on_upload_complete_.Run(response_code);
   current_fetch_.reset();
 }
 
 }  // namespace metrics