Expose passwords to JavaScript in Credential Manager API

third_party/WebKit/Source/modules/fetch/FetchManager.cpp

Index: third_party/WebKit/Source/modules/fetch/FetchManager.cpp
diff --git a/third_party/WebKit/Source/modules/fetch/FetchManager.cpp b/third_party/WebKit/Source/modules/fetch/FetchManager.cpp
index a91f136456639b4eb476551133781fa6d3958670..6af551ad01dc967a65a73dc7dc925dcadd93f9db 100644
--- a/third_party/WebKit/Source/modules/fetch/FetchManager.cpp
+++ b/third_party/WebKit/Source/modules/fetch/FetchManager.cpp
@@ -12,8 +12,10 @@
 #include "core/dom/Document.h"
 #include "core/dom/ExecutionContext.h"
 #include "core/fileapi/Blob.h"
+#include "core/frame/Deprecation.h"
 #include "core/frame/Frame.h"
 #include "core/frame/SubresourceIntegrity.h"
+#include "core/frame/UseCounter.h"
 #include "core/frame/csp/ContentSecurityPolicy.h"
 #include "core/inspector/ConsoleMessage.h"
 #include "core/loader/ThreadableLoader.h"
@@ -725,8 +727,11 @@ void FetchManager::Loader::PerformHTTPFetch(bool cors_flag,
       request_->Method() != HTTPNames::HEAD) {
     if (request_->Buffer())
       request.SetHTTPBody(request_->Buffer()->DrainAsFormData());
-    if (request_->AttachedCredential())
+    if (request_->AttachedCredential()) {
+      Deprecation::CountDeprecation(GetExecutionContext(),
+                                    UseCounter::kCredentialManagerCustomFetch);

[Mike West, 2017/05/04 11:13:33]

I think it would be better to put this counter in the `RequestInit` constructor
instead. That would cover cases in which a developer constructed a `Request`
object separately from the call to `fetch()`. Since that will end up throwing in
the future, it's important to notify folks at the point we'd end up throwing.

[jdoerrie, 2017/05/04 14:24:10]

Done.

       request.SetAttachedCredential(request_->AttachedCredential());
+    }
   }
   request.SetFetchRedirectMode(request_->Redirect());
   request.SetUseStreamOnResponse(true);