Add Promises for EME (Chromium side)

tools/metrics/histograms/histograms.xml

Index: tools/metrics/histograms/histograms.xml
diff --git a/tools/metrics/histograms/histograms.xml b/tools/metrics/histograms/histograms.xml
index 7a013fd6d2015b94a4ef27aa0a431faf50e6a767..c5dd4ebf7f58eb6e9392dd0e0486b36725dbb1a1 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -38805,6 +38805,7 @@ Therefore, the affected-histogram name has to have at least one dot in it.
   <int value="62905097" label="PPB_TrueTypeFont(Dev);0.1"/>
   <int value="79708274" label="PPB_TCPSocket;1.1"/>
   <int value="110360074" label="PPB_Var;1.1"/>
+  <int value="126651696" label="PPB_ContentDecryptor_Private;0.12"/>
   <int value="138418890" label="PPB_Memory(Dev);0.1"/>
   <int value="153443470" label="PPB_URLResponseInfo;1.0"/>
   <int value="153532707" label="PPB_Buffer(Dev);0.4"/>
@@ -38941,7 +38942,6 @@ Therefore, the affected-histogram name has to have at least one dot in it.
   <int value="2062775054" label="PPB_IMEInputEvent(Dev);0.1"/>
   <int value="2070630224" label="PPB_AudioInput(Dev);0.3"/>
   <int value="2095945999" label="PPB_NetAddress_Private;0.1"/>
-  <int value="2098849894" label="PPB_ContentDecryptor_Private;0.10"/>
   <int value="2123225074" label="PPB_HostResolver_Private;0.1"/>
   <int value="2126196629" label="PPB_UDPSocket_Private;0.4"/>
 </enum>