Allow retrieving DevToolsAgentHostImpl from id

This allows to expose certain methods only on the impl,
not on the public interface.

Bug: chromium:1069378
Change-Id: I3623aadb5f9d9ebb7f2dae4c78cb830ee74f55b5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2426043Reviewed-by: Peter Marshall <petermarshall@chromium.org>
Commit-Queue: Sigurd Schneider <sigurds@chromium.org>
Cr-Commit-Position: refs/heads/master@{#809752}

content/browser/devtools/devtools_agent_host_impl.cc

@@ -101,7 +101,7 @@ DevToolsAgentHostImpl::~DevToolsAgentHostImpl() {
 }
 
 // static
-scoped_refptr<DevToolsAgentHost> DevToolsAgentHost::GetForId(
+scoped_refptr<DevToolsAgentHostImpl> DevToolsAgentHostImpl::GetForId(
     const std::string& id) {
   if (!g_devtools_instances.IsCreated())
     return nullptr;
@@ -111,6 +111,12 @@ scoped_refptr<DevToolsAgentHost> DevToolsAgentHost::GetForId(
   return it->second;
 }
 
+// static
+scoped_refptr<DevToolsAgentHost> DevToolsAgentHost::GetForId(
+    const std::string& id) {
+  return DevToolsAgentHostImpl::GetForId(id);
+}
+
 // static
 scoped_refptr<DevToolsAgentHost> DevToolsAgentHost::Forward(
     const std::string& id,

content/browser/devtools/devtools_agent_host_impl.h

@@ -28,6 +28,9 @@ class BrowserContext;
 // Describes interface for managing devtools agents from the browser process.
 class CONTENT_EXPORT DevToolsAgentHostImpl : public DevToolsAgentHost {
  public:
+  // Returns DevToolsAgentHost with a given |id| or nullptr of it doesn't exist.
+  static scoped_refptr<DevToolsAgentHostImpl> GetForId(const std::string& id);
+
   // DevToolsAgentHost implementation.
   bool AttachClient(DevToolsAgentHostClient* client) override;
   bool AttachClientWithoutWakeLock(DevToolsAgentHostClient* client) override;