Add use counters for navigator.requestMediaKeySystemAccess

third_party/WebKit/public/platform/WebFeature.h

Index: third_party/WebKit/public/platform/WebFeature.h
diff --git a/third_party/WebKit/public/platform/WebFeature.h b/third_party/WebKit/public/platform/WebFeature.h
index 20c8dc8a2c340ffb5cb81f47884a67d8cc2d7d73..0ee9e811684f7fe697cd34ff09989c5c6dcd37bd 100644
--- a/third_party/WebKit/public/platform/WebFeature.h
+++ b/third_party/WebKit/public/platform/WebFeature.h
@@ -500,6 +500,7 @@ enum class WebFeature : uint32_t {
   kFullscreenInsecureOrigin = 766,
   kDialogInSandboxedContext = 767,
   kSVGSMILAnimationInImageRegardlessOfCache = 768,
+  kEncryptedMediaSecureOrigin = 770,
   kPerformanceFrameTiming = 772,
   kV8Element_Animate_Method = 773,
   // The above items are available in M44 branch.
@@ -1561,6 +1562,7 @@ enum class WebFeature : uint32_t {
   kDeprecatedTimingFunctionStepMiddle = 2024,
   kDocumentDomainSetWithNonDefaultPort = 2025,
   kDocumentDomainSetWithDefaultPort = 2026,
+  kEncryptedMediaIframe = 2027,

[xhwang, 2017/06/21 17:03:18]

naming nit: "Iframe" is ambiguous. It seems we already have:

AudioContextCrossOriginIframe
WebAudioAutoplayCrossOriginIframe

Should we use "EncryptedMediaCrossOriginIframe" instead?

[raymes, 2017/06/28 03:57:28]

Done.

 
   // Add new features immediately above this line. Don't change assigned
   // numbers of any item, and don't reuse removed slots.