Add UMA metrics to record the size of internal memory available on a user's device when the Update …

base/android/record_histogram.cc

Index: base/android/record_histogram.cc
diff --git a/base/android/record_histogram.cc b/base/android/record_histogram.cc
index 9a68deca54f420aa2136608dc9b097b2f08fb27a..f531cdd1cf083131fd72ed484a8738be1e912759 100644
--- a/base/android/record_histogram.cc
+++ b/base/android/record_histogram.cc
@@ -85,6 +85,29 @@ class HistogramCache {
     return InsertLocked(j_histogram_key, histogram);
   }
 
+  HistogramBase* LinearCountHistogram(JNIEnv* env,
+                                        jstring j_histogram_name,

[Yaron, 2015/08/31 13:53:21]

nit: fix indentation

+                                        jint j_histogram_key,
+                                        jint j_min,
+                                        jint j_max,
+                                        jint j_num_buckets) {
+      DCHECK(j_histogram_name);
+      DCHECK(j_histogram_key);
+      int64 min = static_cast<int64>(j_min);
+      int64 max = static_cast<int64>(j_max);
+      int num_buckets = static_cast<int>(j_num_buckets);
+      HistogramBase* histogram = FindLocked(j_histogram_key);
+      if (histogram) {
+        DCHECK(histogram->HasConstructionArguments(min, max, num_buckets));
+        return histogram;
+      }
+      std::string histogram_name = ConvertJavaStringToUTF8(env, j_histogram_name);

[Yaron, 2015/08/31 13:53:21]

80 cols

+      histogram =
+          LinearHistogram::FactoryGet(histogram_name, min, max, num_buckets,
+                                HistogramBase::kUmaTargetedHistogramFlag);

[Yaron, 2015/08/31 13:53:21]

nit: indentation

+      return InsertLocked(j_histogram_key, histogram);
+    }
+
   HistogramBase* SparseHistogram(JNIEnv* env,
                                  jstring j_histogram_name,
                                  jint j_histogram_key) {
@@ -189,6 +212,22 @@ void RecordCustomCountHistogram(JNIEnv* env,
       ->Add(sample);
 }
 
+void RecordLinearCountHistogram(JNIEnv* env,
+                                jclass clazz,
+                                jstring j_histogram_name,
+                                jint j_histogram_key,
+                                jint j_sample,
+                                jint j_min,
+                                jint j_max,
+                                jint j_num_buckets) {
+  int sample = static_cast<int>(j_sample);
+
+  g_histograms.Get()
+      .LinearCountHistogram(env, j_histogram_name, j_histogram_key, j_min,
+                            j_max, j_num_buckets)
+      ->Add(sample);
+}
+
 void RecordSparseHistogram(JNIEnv* env,
                                  jclass clazz,
                                  jstring j_histogram_name,