[Fetch API] Introduce BytesConsumer

third_party/WebKit/Source/modules/modules.gypi

 {
   'includes': [
     '../core/core_generated.gypi',
     'modules_generated.gypi',
   ],
   'variables': {
     # Experimental hooks for embedder to provide extra IDL and source files.
     #
     # Note: this is not a supported API. If you rely on this, you will be broken
     # from time to time as the code generator changes in backward incompatible
@@ skipping 1012 matching lines @@
       'encryptedmedia/SimpleContentDecryptionModuleResultPromise.cpp',
       'encryptedmedia/SimpleContentDecryptionModuleResultPromise.h',
       'fetch/CompositeDataConsumerHandle.cpp',
       'fetch/CompositeDataConsumerHandle.h',
       'fetch/DataConsumerHandleUtil.cpp',
       'fetch/DataConsumerHandleUtil.h',
       'fetch/Body.cpp',
       'fetch/Body.h',
       'fetch/BodyStreamBuffer.cpp',
       'fetch/BodyStreamBuffer.h',
+      'fetch/BytesConsumer.cpp',
+      'fetch/BytesConsumer.h',
+      'fetch/BytesConsumerForDataConsumerHandle.cpp',
+      'fetch/BytesConsumerForDataConsumerHandle.h',
       'fetch/CrossThreadHolder.h',
       'fetch/DataConsumerTee.cpp',
       'fetch/DataConsumerTee.h',
       'fetch/FetchBlobDataConsumerHandle.cpp',
       'fetch/FetchBlobDataConsumerHandle.h',
       'fetch/FetchDataConsumerHandle.h',
       'fetch/FetchDataLoader.cpp',
       'fetch/FetchDataLoader.h',
       'fetch/FetchFormDataConsumerHandle.cpp',
       'fetch/FetchFormDataConsumerHandle.h',
@@ skipping 933 matching lines @@
       'accessibility/AXObjectTest.cpp',
       'cachestorage/CacheTest.cpp',
       'canvas/HTMLCanvasElementModuleTest.cpp',
       'canvas2d/CanvasRenderingContext2DAPITest.cpp',
       'canvas2d/CanvasRenderingContext2DTest.cpp',
       'compositorworker/CompositorWorkerThreadTest.cpp',
       'credentialmanager/PasswordCredentialTest.cpp',
       'csspaint/PaintRenderingContext2DTest.cpp',
       'csspaint/PaintWorkletTest.cpp',
       'fetch/BodyStreamBufferTest.cpp',
+      'fetch/BytesConsumerForDataConsumerHandleTest.cpp',
       'fetch/CompositeDataConsumerHandleTest.cpp',
       'fetch/DataConsumerHandleTestUtil.cpp',
       'fetch/DataConsumerHandleTestUtil.h',
       'fetch/DataConsumerHandleUtilTest.cpp',
       'fetch/DataConsumerTeeTest.cpp',
       'fetch/FetchBlobDataConsumerHandleTest.cpp',
       'fetch/FetchDataLoaderTest.cpp',
       'fetch/FetchFormDataConsumerHandleTest.cpp',
       'fetch/FetchResponseDataTest.cpp',
       'fetch/ReadableStreamDataConsumerHandleTest.cpp',
@@ skipping 25 matching lines @@
       'webaudio/ConvolverNodeTest.cpp',
       'webaudio/DynamicsCompressorNodeTest.cpp',
       'webaudio/ScriptProcessorNodeTest.cpp',
       'webaudio/StereoPannerNodeTest.cpp',
       'webdatabase/QuotaTrackerTest.cpp',
       'websockets/DOMWebSocketTest.cpp',
       'websockets/DocumentWebSocketChannelTest.cpp',
     ],
   },
 }