Enable size_t to int truncation warnings in PPAPI

ppapi/tests/test_tcp_socket.cc

Index: ppapi/tests/test_tcp_socket.cc
diff --git a/ppapi/tests/test_tcp_socket.cc b/ppapi/tests/test_tcp_socket.cc
index a3164deb6b6c2b2a42f9337ea0278f71eb7b1222..877b469ea4a40b3eef25d1894cb586483a23a82a 100644
--- a/ppapi/tests/test_tcp_socket.cc
+++ b/ppapi/tests/test_tcp_socket.cc
@@ -285,7 +285,7 @@ std::string TestTCPSocket::TestBacklog() {
   }
 
   for (size_t i = 0; i < kBacklog; ++i) {
-    const char byte = 'a' + i;
+    const char byte = static_cast<char>('a' + i);
     ASSERT_SUBTEST_SUCCESS(WriteToSocket(client_sockets[i],
                                          std::string(1, byte)));
   }
@@ -384,7 +384,8 @@ std::string TestTCPSocket::ReadFromSocket(pp::TCPSocket* socket,
   while (num_bytes > 0) {
     TestCompletionCallback callback(instance_->pp_instance(), callback_type());
     callback.WaitForResult(
-        socket->Read(buffer, num_bytes, callback.GetCallback()));
+        socket->Read(buffer, static_cast<int32_t>(num_bytes),
+        callback.GetCallback()));
     CHECK_CALLBACK_BEHAVIOR(callback);
     ASSERT_GT(callback.result(), 0);
     buffer += callback.result();
@@ -401,7 +402,9 @@ std::string TestTCPSocket::WriteToSocket(pp::TCPSocket* socket,
   while (written < s.size()) {
     TestCompletionCallback cb(instance_->pp_instance(), callback_type());
     cb.WaitForResult(
-        socket->Write(buffer + written, s.size() - written, cb.GetCallback()));
+        socket->Write(buffer + written,
+                      static_cast<int32_t>(s.size() - written),
+                      cb.GetCallback()));
     CHECK_CALLBACK_BEHAVIOR(cb);
     ASSERT_GT(cb.result(), 0);
     written += cb.result();
@@ -418,7 +421,8 @@ std::string TestTCPSocket::WriteToSocket_1_0(
   while (written < s.size()) {
     TestCompletionCallback cb(instance_->pp_instance(), callback_type());
     cb.WaitForResult(socket_interface_1_0_->Write(
-        socket, buffer + written, s.size() - written,
+        socket, buffer + written,
+        static_cast<int32_t>(s.size() - written),
         cb.GetCallback().pp_completion_callback()));
     CHECK_CALLBACK_BEHAVIOR(cb);
     ASSERT_GT(cb.result(), 0);