Restart Cody in case of webview renderer crash (#2645)

## Changes

Looks like webview renderer process crashes from time to time for some
users - especially in cases like long running IDE or
suspending/unsuspending OS.

We might not be able to fully fix the root cause, but we should handle
the crash and recover from it.
For now, I'm just restarting the agent which also restarts the webview.
I was trying to only restart the webviews and keep the agent running,
but I did not managed to do it on the first try.
Let's merge this as it improves current situation significantly, and I
will work on better/quicker restoration of the state in the followup
PR(s).

## Test plan

1. Start IntelliJ with Cody panel opened
2. Open process explorer and kill `jcef Helper (Renderer)`
3. Go back to IntelliJ - Cody panel should restart itself

src/main/kotlin/com/sourcegraph/cody/ui/web/WebUIProxy.kt

@@ -5,13 +5,16 @@ import com.google.gson.JsonParser
 import com.intellij.openapi.application.ApplicationManager
 import com.intellij.openapi.diagnostic.Logger
 import com.intellij.openapi.ide.CopyPasteManager
+import com.intellij.openapi.project.ProjectManager
 import com.intellij.ui.jcef.JBCefBrowserBase
 import com.intellij.ui.jcef.JBCefBrowserBuilder
 import com.intellij.ui.jcef.JBCefJSQuery
 import com.sourcegraph.cody.agent.CodyAgent
+import com.sourcegraph.cody.agent.CodyAgentService
 import com.sourcegraph.cody.agent.protocol.WebviewOptions
 import com.sourcegraph.cody.config.CodyApplicationSettings
 import com.sourcegraph.cody.sidebar.WebTheme
+import com.sourcegraph.cody.telemetry.TelemetryV2
 import com.sourcegraph.common.BrowserOpener
 import java.awt.Component
 import java.awt.datatransfer.StringSelection
@@ -325,6 +328,8 @@ private class ExtensionRequestHandler(
     private val proxy: WebUIProxy,
     private val apiScript: String
 ) : CefRequestHandler {
+  private val logger = Logger.getInstance(ExtensionRequestHandler::class.java)
+
   override fun onBeforeBrowse(
       browser: CefBrowser?,
       frame: CefFrame?,
@@ -393,17 +398,27 @@ private class ExtensionRequestHandler(
       sslInfo: CefSSLInfo?,
       callback: CefCallback?
   ): Boolean {
-    // TODO: Add Telemetry here.
+    proxy.openDevTools()
+    logger.warn(
+        """Certificate error occurred while loading URL: $request_url
+        Error code: ${cert_error?.name}
+        SSL Info: $sslInfo"""
+            .trimIndent())
+    ProjectManager.getInstance().openProjects.forEach { project ->
+      TelemetryV2.sendTelemetryEvent(project, "cody.webview.request", "certError")
+    }
     return false
   }
 
   override fun onRenderProcessTerminated(
       browser: CefBrowser?,
       status: CefRequestHandler.TerminationStatus?
   ) {
-    // TODO: Add Telemetry here.
-    // TODO: Logging.
-    // TODO: Trigger a reload.
+    logger.warn("Browser render process terminated: ${status?.name}")
+    ProjectManager.getInstance().openProjects.forEach { project ->
+      TelemetryV2.sendTelemetryEvent(project, "cody.webview.request", "renderProcessTerminated")
+      CodyAgentService.getInstance(project).restartAgent(project)
+    }
   }
 }