mojo: generate Proxies and Stubs for java bindings.

mojo/public/java/bindings/src/org/chromium/mojo/bindings/Encoder.java

Index: mojo/public/java/bindings/src/org/chromium/mojo/bindings/Encoder.java
diff --git a/mojo/public/java/bindings/src/org/chromium/mojo/bindings/Encoder.java b/mojo/public/java/bindings/src/org/chromium/mojo/bindings/Encoder.java
index 9ec2cb248e0bb8cc5e697a29cdec93f84398bbf8..52a9cbd8c5be90167d2054d42aba0827ad531a7b 100644
--- a/mojo/public/java/bindings/src/org/chromium/mojo/bindings/Encoder.java
+++ b/mojo/public/java/bindings/src/org/chromium/mojo/bindings/Encoder.java
@@ -7,6 +7,8 @@ package org.chromium.mojo.bindings;
 import org.chromium.mojo.bindings.Struct.DataHeader;
 import org.chromium.mojo.system.Core;
 import org.chromium.mojo.system.Handle;
+import org.chromium.mojo.system.MessagePipeHandle;
+import org.chromium.mojo.system.Pair;
 
 import java.nio.ByteBuffer;
 import java.nio.ByteOrder;
@@ -139,7 +141,6 @@ public class Encoder {
         Encoder result = new Encoder(mEncoderState);
         result.encode(dataHeader);
         return result;
-
     }
 
     /**
@@ -243,25 +244,43 @@ public class Encoder {
     /**
      * Encode an {@link Interface}.
      */
-    public <T extends Interface> void encode(T v, int offset, Object builder) {
+    public <T extends Interface> void encode(T v, int offset, Interface.Manager<T, ?> manager) {
+        if (v == null) {
+            encode(-1, offset);
+            return;
+        }
         if (mEncoderState.core == null) {
             throw new UnsupportedOperationException(
                     "The encoder has been created without a Core. It can't encode an interface.");
         }
-        // TODO(qsr): To be implemented when interfaces proxy and stubs are implemented.
-        throw new UnsupportedOperationException("Unimplemented operation");
+        // If the instance is a proxy, pass the proxy's handle instead of creating a new stub.
+        if (v instanceof Interface.AbstractProxy) {
+            Interface.AbstractProxy proxy = (Interface.AbstractProxy) v;
+            if (proxy.getMessageReceiver() instanceof HandleOwner) {
+                encode(((HandleOwner<?>) proxy.getMessageReceiver()).passHandle(), offset);
+                return;
+            }
+            // If the proxy is not over a message pipe, the default case applies.
+        }
+        Pair<MessagePipeHandle, MessagePipeHandle> handles =
+                mEncoderState.core.createMessagePipe(null);
+        manager.bind(v, handles.first);
+        encode(handles.second, offset);
     }
 
     /**
      * Encode an {@link InterfaceRequest}.
      */
-    public <T extends Interface> void encode(InterfaceRequest<T> v, int offset) {
+    public <I extends Interface> void encode(InterfaceRequest<I> v, int offset) {
+        if (v == null) {
+            encode(-1, offset);
+            return;
+        }
         if (mEncoderState.core == null) {
             throw new UnsupportedOperationException(
                     "The encoder has been created without a Core. It can't encode an interface.");
         }
-        // TODO(qsr): To be implemented when interfaces proxy and stubs are implemented.
-        throw new UnsupportedOperationException("Unimplemented operation");
+        encode(v.passHandle(), offset);
     }
 
     /**
@@ -374,7 +393,8 @@ public class Encoder {
     /**
      * Encodes an array of {@link Interface}.
      */
-    public <T extends Interface> void encode(T[] v, int offset, Object builder) {
+    public <T extends Interface> void encode(T[] v, int offset,
+            Interface.Manager<T, ?> manager) {
         if (v == null) {
             encodeNullPointer(offset);
             return;
@@ -382,14 +402,14 @@ public class Encoder {
         Encoder e = encoderForArray(BindingsHelper.SERIALIZED_HANDLE_SIZE, v.length, offset);
         for (int i = 0; i < v.length; ++i) {
             e.encode(v[i], DataHeader.HEADER_SIZE + BindingsHelper.SERIALIZED_HANDLE_SIZE * i,
-                    builder);
+                    manager);
         }
     }
 
     /**
-     * Encodes an array of {@link Interface}.
+     * Encodes an array of {@link InterfaceRequest}.
      */
-    public <T extends Interface> void encode(InterfaceRequest<T>[] v, int offset) {
+    public <I extends Interface> void encode(InterfaceRequest<I>[] v, int offset) {
         if (v == null) {
             encodeNullPointer(offset);
             return;