This CL adds a script to print detailed info about Mojo messages given
a trace file. Below are some examples of what the script shows (taken from
https://docs.google.com/presentation/d/1D2riladajllLuNHkQgiJhEZVlaXavV4KJjldouGVgBo/edit?usp=sharing)
For a drag and drop (summary view):
```
ts_delta process_name name
...
0.890756 Renderer Send viz::mojom::CompositorFrameSink::SubmitCompositorFrame
0.891466 GPU Process Receive viz::mojom::CompositorFrameSink::SubmitCompositorFrame
0.892181 Browser Send blink::mojom::FrameWidget::DragTargetDragEnter
0.892277 GPU Process Send viz::mojom::FrameSinkManagerClient::OnFrameTokenChanged
0.892521 Browser Send blink::mojom::FrameWidget::DragTargetDragOver
0.893285 Renderer Receive blink::mojom::FrameWidget::DragTargetDragEnter
0.893322 Browser Send blink::mojom::FrameWidget::DragTargetDrop
0.893826 Renderer Send content::mojom::ChildProcessHost::BindHostReceiver
0.893971 Renderer Call blink::mojom::MimeRegistry::GetMimeTypeFromExtension (sync)
...
```
For a CreateURLLoaderFactory call (detailed view):
```
ts_delta process_name pid thread_name name
...
0.764298 Browser 1 CrBrowserMain Send network::mojom::NetworkContext::CreateURLLoaderFactory
input_parameters:
url_loader_factory: <value of type ::mojo::PendingReceiver<::network::mojom::URLLoaderFactory>>
params.process_id: 5
params.request_initiator_origin_lock: http://127.0.0.1:34789
params.is_corb_enabled: 1
params.ignore_isolated_world_origin: 1
params.unsafe_non_webby_initiator: 0
params.disable_web_security: 0
params.header_client: <value of type ::mojo::PendingRemote<TrustedURLLoaderHeaderClient>>
params.isolation_info: <value of type const ::net::IsolationInfo&>
params.disable_secure_dns: 0
params.is_trusted: 0
params.automatically_assign_isolation_info: 0
params.provide_loading_state_updates: 1
params.top_frame_id: EDDCF5B62240FE18E3A2899304FFD89F
params.factory_override: 0
params.coep_reporter: <value of type ::mojo::PendingRemote<::network::mojom::CrossOriginEmbedderPolicyReporter>>
params.cookie_observer: <value of type ::mojo::PendingRemote<::network::mojom::CookieAccessObserver>>
params.url_loader_network_observer: <value of type ::mojo::PendingRemote<::network::mojom::URLLoaderNetworkServiceObserver>>
params.devtools_observer: <value of type ::mojo::PendingRemote<::network::mojom::DevToolsObserver>>
params.trust_token_redemption_policy: kPotentiallyPermit
params.debug_tag: RFHI::CommitNavigation
params.client_security_state.cross_origin_embedder_policy: <value of type const ::network::CrossOriginEmbedderPolicy&>
params.client_security_state.is_web_secure_context: 1
params.client_security_state.ip_address_space: kLocal
params.client_security_state.private_network_request_policy: kPreflightBlock
...
```
Bug: 336984033
Change-Id: I0140dcd052e63975d1bea045584462d5f684f4ed
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3370782
Reviewed-by: Alexander Timin <altimin@chromium.org>
Commit-Queue: Andrew Williams <awillia@chromium.org>
Reviewed-by: Bruce Dawson <brucedawson@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1292760}
