Moving gRPC support interfaces out of cronet and into a new component.

components/grpc_support/bidirectional_stream.h

Index: components/grpc_support/bidirectional_stream.h
diff --git a/components/cronet/ios/cronet_bidirectional_stream.h b/components/grpc_support/bidirectional_stream.h
similarity index 87%
rename from components/cronet/ios/cronet_bidirectional_stream.h
rename to components/grpc_support/bidirectional_stream.h
index 9df7de1766f55db7bca49b8e06a6a9b31c442d80..d57cd87f4b87aba25dc5a121f27deae6d0f126ab 100644
--- a/components/cronet/ios/cronet_bidirectional_stream.h
+++ b/components/grpc_support/bidirectional_stream.h
@@ -2,8 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#ifndef COMPONENTS_CRONET_IOS_CRONET_BIDIRECTIONAL_STREAM_H_
-#define COMPONENTS_CRONET_IOS_CRONET_BIDIRECTIONAL_STREAM_H_
+#ifndef COMPONENTS_GRPC_SUPPORT_BIDIRECTIONAL_STREAM_H_
+#define COMPONENTS_GRPC_SUPPORT_BIDIRECTIONAL_STREAM_H_
 
 #include <memory>
 #include <vector>
@@ -13,15 +13,14 @@
 #include "base/memory/weak_ptr.h"
 #include "base/synchronization/lock.h"
 #include "net/http/bidirectional_stream.h"
+#include "net/url_request/url_request_context_getter.h"
 
 namespace net {
 class HttpRequestHeaders;
 class WrappedIOBuffer;
 }  // namespace net
 
-namespace cronet {
-
-class CronetEnvironment;
+namespace grpc_support {
 
 // An adapter to net::BidirectionalStream.
 // Created and configured from any thread. Start, ReadData, WriteData and
@@ -31,7 +30,7 @@ class CronetEnvironment;
 // callbacks into the Delegate are done on the network thread.
 // The app is expected to initiate the next step like ReadData or Destroy.
 // Public methods can be called on any thread.
-class CronetBidirectionalStream : public net::BidirectionalStream::Delegate {
+class BidirectionalStream : public net::BidirectionalStream::Delegate {
  public:
   class Delegate {
    public:
@@ -53,8 +52,9 @@ class CronetBidirectionalStream : public net::BidirectionalStream::Delegate {
     virtual void OnCanceled() = 0;
   };
 
-  CronetBidirectionalStream(CronetEnvironment* environment, Delegate* delegate);
-  ~CronetBidirectionalStream() override;
+  BidirectionalStream(net::URLRequestContextGetter* request_context_getter,
+                      Delegate* delegate);
+  ~BidirectionalStream() override;
 
   // Disables automatic flushing of each buffer passed to WriteData().
   void disable_auto_flush(bool disable_auto_flush) {
@@ -119,7 +119,7 @@ class CronetBidirectionalStream : public net::BidirectionalStream::Delegate {
     // Stream is canceled.
     CANCELED,
     // Error has occured, stream is closed.
-    ERROR,
+    ERR,

[Garrett Casto, 2016/10/24 18:34:25]

Note: This was changed because the Window compiler had an issue with this
conflicting with the logging macro ERROR. I'm open to changing the name.

[mef, 2016/10/26 22:19:45]

Acknowledged.

     // Reading and writing are done, and the stream is closed successfully.
     SUCCESS,
     // Waiting for Flush() to be called.
@@ -187,17 +187,21 @@ class CronetBidirectionalStream : public net::BidirectionalStream::Delegate {
   void CancelOnNetworkThread();
   void DestroyOnNetworkThread();
 
+  bool IsOnNetworkThread();
+  void PostToNetworkThread(const tracked_objects::Location& from_here,
+                           const base::Closure& task);
+
   // Read state is tracking reading flow. Only accessed on network thread.
-  //                         / <--- READING <--- \
+  //                         | <--- READING <--- |

[Garrett Casto, 2016/10/24 18:34:26]

Note: Android compiler didn't like the "/  <" character sequence. I don't
remember the exact error message, something to do with multi line comments,
which I thought was strange.

[mef, 2016/10/26 22:19:45]

Acknowledged.

+  //                         |                   |
   //                         |                   |
-  //                         \                   /
   // NOT_STARTED -> STARTED --> WAITING_FOR_READ -> READING_DONE -> SUCCESS
   State read_state_;
 
   // Write state is tracking writing flow.  Only accessed on network thread.
-  //                         / <--- WRITING <---  \
+  //                         | <--- WRITING <---  |
+  //                         |                    |
   //                         |                    |
-  //                         \                    /
   // NOT_STARTED -> STARTED --> WAITING_FOR_FLUSH -> WRITING_DONE -> SUCCESS
   State write_state_;
 
@@ -207,7 +211,7 @@ class CronetBidirectionalStream : public net::BidirectionalStream::Delegate {
   bool disable_auto_flush_;
   bool delay_headers_until_flush_;
 
-  CronetEnvironment* const environment_;
+  net::URLRequestContextGetter* const request_context_getter_;
 
   scoped_refptr<net::WrappedIOBuffer> read_buffer_;
 
@@ -221,12 +225,12 @@ class CronetBidirectionalStream : public net::BidirectionalStream::Delegate {
   std::unique_ptr<net::BidirectionalStream> bidi_stream_;
   Delegate* delegate_;
 
-  base::WeakPtr<CronetBidirectionalStream> weak_this_;
-  base::WeakPtrFactory<CronetBidirectionalStream> weak_factory_;
+  base::WeakPtr<BidirectionalStream> weak_this_;
+  base::WeakPtrFactory<BidirectionalStream> weak_factory_;
 
-  DISALLOW_COPY_AND_ASSIGN(CronetBidirectionalStream);
+  DISALLOW_COPY_AND_ASSIGN(BidirectionalStream);
 };
 
-}  // namespace cronet
+}  // namespace grpc_support
 
-#endif  // COMPONENTS_CRONET_IOS_CRONET_BIDIRECTIONAL_STREAM_H_
+#endif  // COMPONENTS_GRPC_SUPPORT_BIDIRECTIONAL_STREAM_H_