Introduce intercepting and handling devtools messages in the renderer.

content/browser/devtools/renderer_overrides_handler.cc

+// Copyright (c) 2013 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "content/browser/devtools/renderer_overrides_handler.h"
+
+#include <string>
+
+#include "base/bind.h"
+#include "base/bind_helpers.h"
+#include "base/file_path.h"
+#include "base/stringprintf.h"
+#include "base/values.h"
+#include "content/browser/child_process_security_policy_impl.h"
+#include "content/public/browser/devtools_agent_host.h"
+#include "content/public/browser/render_process_host.h"
+#include "content/public/browser/render_view_host.h"
+
+namespace content {
+
+namespace {
+
+const char kFileInputCommand[] = "DOM.setFileInputFiles";
+const char kFileInputFilesParam[] = "files";
+
+}  // namespace
+
+RendererOverridesHandler::RendererOverridesHandler(DevToolsAgentHost* agent)
+    : agent_(agent) {
+  RegisterCommandHandler(
+      kFileInputCommand,
+      base::Bind(
+          &RendererOverridesHandler::GrantPermissionsForSetFileInputFiles,
+          base::Unretained(this)));
+}
+
+RendererOverridesHandler::~RendererOverridesHandler() {}
+
+scoped_ptr<DevToolsProtocol::Response>
+RendererOverridesHandler::GrantPermissionsForSetFileInputFiles(
+    DevToolsProtocol::Command* command) {
+  const base::ListValue* file_list;
+  if (!command->params()->GetList(kFileInputFilesParam, &file_list)) {
+    return command->ErrorResponse(
+        DevToolsProtocol::kErrorInvalidParams,
+        base::StringPrintf("Missing or invalid '%s' parameter",
+                           kFileInputFilesParam));
+  }
+  for (size_t i = 0; i < file_list->GetSize(); ++i) {
+    base::FilePath::StringType file;
+    if (!file_list->GetString(i, &file)) {
+      return command->ErrorResponse(
+          DevToolsProtocol::kErrorInvalidParams,
+          base::StringPrintf("'%s' must be a list of strings",
+                             kFileInputFilesParam));
+    }
+    ChildProcessSecurityPolicyImpl::GetInstance()->GrantReadFile(
+        agent_->GetRenderViewHost()->GetProcess()->GetID(),
+        base::FilePath(file));
+  }
+  return scoped_ptr<DevToolsProtocol::Response>();
+}
+
+}  // namespace content