perfetto: Propagate --perfetto-disable-interning to child processes

This was missing before, rendering the flag useless for non-browser
process tracing.

Change-Id: I49222c8582432b1ebe72695bca5d434f0097130f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1877016
Auto-Submit: Eric Seckler <eseckler@chromium.org>
Commit-Queue: Avi Drissman <avi@chromium.org>
Reviewed-by: Avi Drissman <avi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#709200}

content/browser/browser_child_process_host_impl.cc

@@ -336,6 +336,7 @@ void BrowserChildProcessHostImpl::LaunchWithoutExtraCommandLineSwitches(
       switches::kLogBestEffortTasks,
       switches::kLogFile,
       switches::kLoggingLevel,
+      switches::kPerfettoDisableInterning,
       switches::kTraceToConsole,
       switches::kV,
       switches::kVModule,

content/browser/renderer_host/render_process_host_impl.cc

@@ -3125,6 +3125,7 @@ void RenderProcessHostImpl::PropagateBrowserCommandLineToRenderer(
     switches::kNoZygote,
     switches::kOverridePluginPowerSaverForTesting,
     switches::kPassiveListenersDefault,
+    switches::kPerfettoDisableInterning,
     switches::kPpapiInProcess,
     switches::kProfilingAtStart,
     switches::kProfilingFile,