base/android/animation_frame_time_histogram.cc

   1 // Copyright 2015 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "base/android/animation_frame_time_histogram.h"
   6
   7 #include "base/android/jni_string.h"
   8 #include "base/metrics/histogram_macros.h"
   9 #include "jni/AnimationFrameTimeHistogram_jni.h"
  10
  11 // static
  12 void SaveHistogram(JNIEnv* env,
  13                    const JavaParamRef<jobject>& jcaller,
  14                    const JavaParamRef<jstring>& j_histogram_name,
  15                    const JavaParamRef<jlongArray>& j_frame_times_ms,
  16                    jint j_count) {
  17   jlong *frame_times_ms = env->GetLongArrayElements(j_frame_times_ms, NULL);
  18   std::string histogram_name = base::android::ConvertJavaStringToUTF8(
  19       env, j_histogram_name);
  20
  21   for (int i = 0; i < j_count; ++i) {
  22     UMA_HISTOGRAM_TIMES(histogram_name.c_str(),
  23                         base::TimeDelta::FromMilliseconds(frame_times_ms[i]));
  24   }
  25 }
  26
  27 namespace base {
  28 namespace android {
  29
  30 // static
  31 bool RegisterAnimationFrameTimeHistogram(JNIEnv* env) {
  32   return RegisterNativesImpl(env);
  33 }
  34
  35 }  // namespace android
  36 }  // namespace base