Add crash keys for BufferedBody::OnDataAvailable

We're seeing some OOMs and want to investigate what's happening.

Bug: 1147081
Change-Id: I9101462643783ea2e6fac50357b2c4043c8c808c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2528556
Commit-Queue: Rakina Zata Amni <rakina@chromium.org>
Reviewed-by: Yutaka Hirano <yhirano@chromium.org>
Cr-Commit-Position: refs/heads/master@{#825801}

content/renderer/loader/url_loader_client_impl.cc

@@ -165,6 +165,14 @@ class URLLoaderClientImpl::BodyBuffer final
   // mojo::DataPipeDrainer::Client
   void OnDataAvailable(const void* data, size_t num_bytes) override {
     DCHECK(draining_);
+    SCOPED_CRASH_KEY_NUMBER(OnDataAvailable, buffered_body_bytes,
+                            buffered_body_.size());
+    SCOPED_CRASH_KEY_NUMBER(OnDataAvailable, remaining_bytes,
+                            bytes_remaining_in_buffer_);
+    SCOPED_CRASH_KEY_NUMBER(OnDataAvailable, data_bytes, num_bytes);
+    SCOPED_CRASH_KEY_STRING256(
+        OnDataAvailable, last_loaded_url,
+        owner_->last_loaded_url().possibly_invalid_spec());
     const auto span =
         base::make_span(static_cast<const char*>(data), num_bytes);
     buffered_body_.insert(buffered_body_.end(), span.begin(), span.end());

content/renderer/loader/url_loader_client_impl.h

@@ -76,6 +76,8 @@ class CONTENT_EXPORT URLLoaderClientImpl final
       mojo::ScopedDataPipeConsumerHandle body) override;
   void OnComplete(const network::URLLoaderCompletionStatus& status) override;
 
+  const GURL& last_loaded_url() const { return last_loaded_url_; }
+
  private:
   class BodyBuffer;
   class DeferredMessage;