Blimp: Add BlobChannel Helium messages and delegate impls.

blimp/common/logging.cc

Index: blimp/common/logging.cc
diff --git a/blimp/common/logging.cc b/blimp/common/logging.cc
index 6f5587b20843d6e1e5ebb98c77a8b7b944421679..53152ea633199a6958c954843abdb969b5e652d8 100644
--- a/blimp/common/logging.cc
+++ b/blimp/common/logging.cc
@@ -12,8 +12,10 @@
 #include "base/json/string_escape.h"
 #include "base/lazy_instance.h"
 #include "base/memory/ptr_util.h"
+#include "base/strings/string_number_conversions.h"
 #include "base/strings/string_util.h"
 #include "base/strings/stringprintf.h"
+#include "blimp/common/create_blimp_message.h"
 #include "blimp/common/proto/blimp_message.pb.h"
 
 namespace blimp {
@@ -248,6 +250,24 @@ class TabControlLogExtractor : public LogExtractor {
   }
 };
 
+// Logs fields from BLOB_CHANNEL messages.
+class BlobChannelLogExtractor : public LogExtractor {
+  void ExtractFields(const BlimpMessage& message,
+                     LogFields* output) const override {
+    switch (message.blob_channel().type()) {
+      case BlobChannelMessage::TRANSFER_BLOB:
+        AddField("subtype", "TRANSFER_BLOB", output);
+      default:
+        break;
+    }
+    if (message.blob_channel().has_blob_id()) {
+      AddField("id", base::HexEncode(message.blob_channel().blob_id().data(),
+                                     message.blob_channel().blob_id().size()),
+               output);
+    }
+  }
+};
+
 // No fields are extracted from |message|.
 class NullLogExtractor : public LogExtractor {
   void ExtractFields(const BlimpMessage& message,
@@ -271,6 +291,8 @@ BlimpMessageLogger::BlimpMessageLogger() {
              base::WrapUnique(new SettingsLogExtractor));
   AddHandler("TAB_CONTROL", BlimpMessage::TAB_CONTROL,
              base::WrapUnique(new TabControlLogExtractor));
+  AddHandler("BLOB_CHANNEL", BlimpMessage::BLOB_CHANNEL,
+             base::WrapUnique(new BlobChannelLogExtractor));
 }
 
 BlimpMessageLogger::~BlimpMessageLogger() {}