BytesConsumer::endRead can return Done

third_party/WebKit/Source/modules/fetch/BytesConsumer.h

Index: third_party/WebKit/Source/modules/fetch/BytesConsumer.h
diff --git a/third_party/WebKit/Source/modules/fetch/BytesConsumer.h b/third_party/WebKit/Source/modules/fetch/BytesConsumer.h
index 6f73c0b76c20fd67b364a5fccc6addd68d54817c..09cd08bbddeb8e4b7d2a829adc85db0181a0deb4 100644
--- a/third_party/WebKit/Source/modules/fetch/BytesConsumer.h
+++ b/third_party/WebKit/Source/modules/fetch/BytesConsumer.h
@@ -91,6 +91,10 @@ public:
     virtual Result beginRead(const char** buffer, size_t* available) WARN_UNUSED_RESULT = 0;
 
     // Ends a two-phase read.
+    // This function can modify this BytesConsumer's state.
+    // Returns Ok when the consumer stays readable or waiting.
+    // Returns Done when it's closed.
+    // Returns Error when it's errored.
     virtual Result endRead(size_t readSize) WARN_UNUSED_RESULT = 0;
 
     // Drains the data as a BlobDataHandle.