Add UMA reporting to CdmPromise.

media/base/cdm_promise.cc

Index: media/base/cdm_promise.cc
diff --git a/media/base/cdm_promise.cc b/media/base/cdm_promise.cc
index ec5e913dbb8aae93c90aa30a24835aaa1a3cc3e8..e57d4f49f0780f4fc80a57279d0f195c496f3134 100644
--- a/media/base/cdm_promise.cc
+++ b/media/base/cdm_promise.cc
@@ -6,6 +6,7 @@
 
 #include "base/bind.h"
 #include "base/logging.h"
+#include "base/metrics/histogram.h"
 
 namespace media {
 
@@ -17,15 +18,48 @@ CdmPromise::CdmPromise(PromiseRejectedCB reject_cb)
   DCHECK(!reject_cb_.is_null());
 }
 
+CdmPromise::CdmPromise(PromiseRejectedCB reject_cb, const std::string& uma_name)
+    : reject_cb_(reject_cb), is_pending_(true), uma_name_(uma_name) {
+  DCHECK(!reject_cb_.is_null());
+}
+
 CdmPromise::~CdmPromise() {
   DCHECK(!is_pending_);
 }
 
+static CdmPromise::ResultCodeForUMA ConvertExceptionToUMAResult(
+    MediaKeys::Exception exception_code) {
+  switch (exception_code) {
+    case MediaKeys::NOT_SUPPORTED_ERROR:
+      return CdmPromise::NOT_SUPPORTED_ERROR;
+    case MediaKeys::INVALID_STATE_ERROR:
+      return CdmPromise::INVALID_STATE_ERROR;
+    case MediaKeys::INVALID_ACCESS_ERROR:
+      return CdmPromise::INVALID_ACCESS_ERROR;
+    case MediaKeys::QUOTA_EXCEEDED_ERROR:
+      return CdmPromise::QUOTA_EXCEEDED_ERROR;
+    case MediaKeys::UNKNOWN_ERROR:
+      return CdmPromise::UNKNOWN_ERROR;
+    case MediaKeys::CLIENT_ERROR:
+      return CdmPromise::CLIENT_ERROR;
+    case MediaKeys::OUTPUT_ERROR:
+      return CdmPromise::OUTPUT_ERROR;
+  }
+  NOTREACHED();
+  return CdmPromise::UNKNOWN_ERROR;
+}
+
 void CdmPromise::reject(MediaKeys::Exception exception_code,
                         uint32 system_code,
                         const std::string& error_message) {
   DCHECK(is_pending_);
   is_pending_ = false;
+  if (!uma_name_.empty()) {
+    ResultCodeForUMA result_code = ConvertExceptionToUMAResult(exception_code);
+    base::LinearHistogram::FactoryGet(
+        uma_name_, 1, NUM_RESULT_CODES, NUM_RESULT_CODES + 1,
+        base::HistogramBase::kUmaTargetedHistogramFlag)->Add(result_code);
+  }
   reject_cb_.Run(exception_code, system_code, error_message);
 }
 
@@ -38,6 +72,15 @@ CdmPromiseTemplate<T>::CdmPromiseTemplate(
 }
 
 template <typename T>
+CdmPromiseTemplate<T>::CdmPromiseTemplate(
+    base::Callback<void(const T&)> resolve_cb,
+    PromiseRejectedCB reject_cb,
+    const std::string& uma_name)
+    : CdmPromise(reject_cb, uma_name), resolve_cb_(resolve_cb) {
+  DCHECK(!resolve_cb_.is_null());
+}
+
+template <typename T>
 CdmPromiseTemplate<T>::~CdmPromiseTemplate() {
   DCHECK(!is_pending_);
 }
@@ -46,6 +89,11 @@ template <typename T>
 void CdmPromiseTemplate<T>::resolve(const T& result) {
   DCHECK(is_pending_);
   is_pending_ = false;
+  if (!uma_name_.empty()) {
+    base::LinearHistogram::FactoryGet(
+        uma_name_, 1, NUM_RESULT_CODES, NUM_RESULT_CODES + 1,
+        base::HistogramBase::kUmaTargetedHistogramFlag)->Add(SUCCESS);
+  }
   resolve_cb_.Run(result);
 }
 
@@ -55,6 +103,14 @@ CdmPromiseTemplate<void>::CdmPromiseTemplate(base::Callback<void()> resolve_cb,
   DCHECK(!resolve_cb_.is_null());
 }
 
+CdmPromiseTemplate<void>::CdmPromiseTemplate(base::Callback<void()> resolve_cb,
+                                             PromiseRejectedCB reject_cb,
+                                             const std::string& uma_name)
+    : CdmPromise(reject_cb, uma_name), resolve_cb_(resolve_cb) {
+  DCHECK(!resolve_cb_.is_null());
+  DCHECK(!uma_name_.empty());
+}
+
 CdmPromiseTemplate<void>::CdmPromiseTemplate() {
 }
 
@@ -65,6 +121,11 @@ CdmPromiseTemplate<void>::~CdmPromiseTemplate() {
 void CdmPromiseTemplate<void>::resolve() {
   DCHECK(is_pending_);
   is_pending_ = false;
+  if (!uma_name_.empty()) {
+    base::LinearHistogram::FactoryGet(
+        uma_name_, 1, NUM_RESULT_CODES, NUM_RESULT_CODES + 1,
+        base::HistogramBase::kUmaTargetedHistogramFlag)->Add(SUCCESS);
+  }
   resolve_cb_.Run();
 }