Add serial bulk reads.

chrome/browser/extensions/api/serial/serial_apitest.cc

Index: chrome/browser/extensions/api/serial/serial_apitest.cc
diff --git a/chrome/browser/extensions/api/serial/serial_apitest.cc b/chrome/browser/extensions/api/serial/serial_apitest.cc
index db0d110d0d0f96ac9194222e1f064066671ffe53..16a7ab8d4532510eded23aa59ec39388dda7da04 100644
--- a/chrome/browser/extensions/api/serial/serial_apitest.cc
+++ b/chrome/browser/extensions/api/serial/serial_apitest.cc
@@ -77,16 +77,21 @@ class FakeEchoSerialConnection : public SerialConnection {
     read_index_ = write_index_ = 0;
   }
 
-  virtual int Read(uint8* byte) {
-    DCHECK(byte);
+  virtual int Read(scoped_refptr<net::IOBufferWithSize> io_buffer) {
+    DCHECK(io_buffer->data());
+    DCHECK(io_buffer->size() <= BUFFER_SIZE);
 
     if (read_index_ >= write_index_) {

[Peng, 2012/08/01 22:14:00]

As it is a ring bufer, I think just testing read_index >= write_index is not
enough.

       return 0;
     }
-    *byte = ring_buffer_[read_index_++];
-    if (read_index_ == BUFFER_SIZE)
-      read_index_ = 0;
-    return 1;
+    char *data = io_buffer->data();
+    int bytes_to_copy = io_buffer->size();
+    while (bytes_to_copy--) {
+      *data++ = ring_buffer_[read_index_++];
+      if (read_index_ == BUFFER_SIZE)
+        read_index_ = 0;
+    }
+    return io_buffer->size();
   }
 
   virtual int Write(scoped_refptr<net::IOBuffer> io_buffer, int byte_count) {