gpu: Implement debug logging on Android

This patch adds an Android backend for gpu::Logging. The debug log
output is written to logcat with the log tag "chromium-gpu".

BUG=232449

Review URL: https://chromiumcodereview.appspot.com/17471007

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@208059 0039d316-1c4b-4281-b951-d872f2087c98

gpu/command_buffer/command_buffer.gypi

@@ -21,6 +21,16 @@
           'common/logging.cc',
           'common/logging.h',
         ],
+        'conditions': [
+          ['OS=="android"', {
+            'sources!': [
+              'common/logging.cc',
+            ],
+            'sources': [
+              'common/logging_android.cc',
+            ],
+          }],
+        ],
       }],
     ],
   },

gpu/command_buffer/common/logging_android.cc

+// Copyright 2013 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 <android/log.h>
+#include <iostream>
+#include <sstream>
+
+#include "gpu/command_buffer/common/logging.h"
+
+namespace gpu {
+
+namespace {
+std::stringstream* g_log;
+const char* kLogTag = "chromium-gpu";
+}
+
+std::ostream& Logger::stream() {
+  if (!g_log)
+    g_log = new std::stringstream();
+  return *g_log;
+}
+
+Logger::~Logger() {
+  if (!condition_) {
+    __android_log_print(ANDROID_LOG_INFO, kLogTag, "%s", g_log->str().c_str());
+    g_log->str(std::string());
+    if (level_ == FATAL)
+      assert(false);
+  }
+}
+
+}  // namespace gpu