Increase WebDriverServer max buffer size.

Resolves timeout issues when screenshots exceed the default 1mb buffer
size and are unable to be sent.

b/344007302

cobalt/webdriver/server.cc

@@ -76,7 +76,10 @@ class ResponseHandlerImpl : public WebDriverServer::ResponseHandler {
   ResponseHandlerImpl(net::HttpServer* server, int connection_id)
       : task_runner_(base::SequencedTaskRunner::GetCurrentDefault()),
         server_(server),
-        connection_id_(connection_id) {}
+        connection_id_(connection_id) {
+    server_->SetReceiveBufferSize(connection_id_, kMaxRecieveBufferSize);
+    server_->SetSendBufferSize(connection_id_, kMaxSendBufferSize);
+  }
 
   // https://www.selenium.dev/documentation/legacy/json_wire_protocol/#responses
   void Success(std::unique_ptr<base::Value> value) override {

cobalt/webdriver/server.h

@@ -54,6 +54,9 @@ class WebDriverServer : public net::HttpServer::Delegate {
   // client.
   class ResponseHandler {
    public:
+    static const int kMaxRecieveBufferSize = 2 * 1024 * 1024;  // 2 Mbytes.
+    static const int kMaxSendBufferSize = 8 * 1024 * 1024;     // 8 Mbytes.
+
     // Called after a successful WebDriver command.
     // https://www.selenium.dev/documentation/legacy/json_wire_protocol/#responses
     virtual void Success(std::unique_ptr<base::Value>) = 0;