Add to_snake_case function in make_instrumenting_probes.py

The primary motivation is that the data member names are not following
proper naming conventions within probe_sink.h.tmpl and
instrumenting_probes_impl.cc.tmpl.

This CL add to_snake_case function in make_instrumenting_probes.py to
convert data members to snake case format.

Bug: 936684
Change-Id: I9934aec12dfd85094335078f7c1784f56d6aafac
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1524801
Commit-Queue: Abhijeet Kandalkar <abhijeet@igalia.com>
Reviewed-by: Kent Tamura <tkent@chromium.org>
Cr-Commit-Position: refs/heads/master@{#641094}

third_party/blink/renderer/build/scripts/make_instrumenting_probes.py

@@ -46,8 +46,8 @@ def to_singular(text):
     return text[:-1] if text[-1] == "s" else text
 
 
-def to_lower_case(name):
-    return name[:1].lower() + name[1:]
+def to_snake_case(name):
+    return NameStyleConverter(name).to_snake_case()
 
 
 def agent_config(config, agent_name, field):
@@ -74,7 +74,7 @@ def initialize_jinja_env(config, cache_dir):
         lstrip_blocks=True,  # so can indent control flow tags
         trim_blocks=True)
     jinja_env.filters.update({
-        "to_lower_case": to_lower_case,
+        "to_snake_case": to_snake_case,
         "to_singular": to_singular,
         "agent_name_to_class": partial(agent_name_to_class, config),
         "agent_name_to_include": partial(agent_name_to_include, config)})

third_party/blink/renderer/build/scripts/templates/instrumenting_probes_impl.cc.tmpl

@@ -42,7 +42,7 @@ std::atomic<unsigned> {{sink_class}}::s_existingAgents;
 
 {% for agent in agents %}
 {% set class_name = agent | agent_name_to_class %}
-{% set getter_name = agent | to_lower_case %}
+{% set getter_name = agent | to_snake_case %}
 
 // static
 unsigned {{sink_class}}::s_numSinksWith{{agent}} = 0;
@@ -81,7 +81,7 @@ void {{sink_class}}::Remove{{agent}}({{class_name}}* agent) {
 void {{sink_class}}::Trace(Visitor* visitor)
 {
 {% for agent in agents %}
-{% set getter_name = agent | to_lower_case %}
+{% set getter_name = agent | to_snake_case %}
   visitor->Trace({{getter_name}}s_);
 {% endfor %}
 }

third_party/blink/renderer/build/scripts/templates/probe_sink.h.tmpl

@@ -41,7 +41,7 @@ class {{export_symbol}} {{sink_class}} : public GarbageCollectedFinalized<{{sink
 
 {% for agent in agents %}
 {% set class_name = agent | agent_name_to_class %}
-{% set getter_name = agent | to_lower_case %}
+{% set getter_name = agent | to_snake_case %}
   bool Has{{agent}}s() const { return !{{getter_name}}s_.IsEmpty(); }
   const HeapListHashSet<Member<{{class_name}}>>& {{class_name}}s() const { return {{getter_name}}s_; }
   void Add{{agent}}({{class_name}}* agent);
@@ -56,7 +56,7 @@ class {{export_symbol}} {{sink_class}} : public GarbageCollectedFinalized<{{sink
  private:
 {% for agent in agents %}
 {% set class_name = agent | agent_name_to_class %}
-{% set getter_name = agent | to_lower_case %}
+{% set getter_name = agent | to_snake_case %}
   HeapListHashSet<Member<{{class_name}}>> {{getter_name}}s_;
 {% endfor %}