[headless] Refactor headless devtools client API.

headless/lib/browser/devtools_api/domain_h.template

Index: headless/lib/browser/devtools_api/domain_h.template
diff --git a/headless/lib/browser/domain_h.template b/headless/lib/browser/devtools_api/domain_h.template
similarity index 92%
rename from headless/lib/browser/domain_h.template
rename to headless/lib/browser/devtools_api/domain_h.template
index 2d146a70b52e34dec2ab6204c39660ee19507539..69d3b3436c0138aaeb95d428fc46698c3545c9e6 100644
--- a/headless/lib/browser/domain_h.template
+++ b/headless/lib/browser/devtools_api/domain_h.template
@@ -4,13 +4,15 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#ifndef HEADLESS_PUBLIC_DOMAINS_{{domain.domain | camelcase_to_hacker_style | upper}}_H_
-#define HEADLESS_PUBLIC_DOMAINS_{{domain.domain | camelcase_to_hacker_style | upper}}_H_
+#ifndef HEADLESS_PUBLIC_DEVTOOLS_DOMAINS_{{domain.domain | camelcase_to_hacker_style | upper}}_H_
+#define HEADLESS_PUBLIC_DEVTOOLS_DOMAINS_{{domain.domain | camelcase_to_hacker_style | upper}}_H_
 
 #include "base/callback.h"
 #include "base/observer_list.h"
 #include "base/values.h"
-#include "headless/public/domains/types.h"
+{% for domain_name in domain.dependencies %}
+#include "headless/public/devtools/domains/types_{{domain_name | camelcase_to_hacker_style}}.h"
+{% endfor %}
 #include "headless/public/headless_export.h"
 #include "headless/public/internal/message_dispatcher.h"
 
@@ -152,4 +154,4 @@ class ExperimentalDomain : public Domain {
 }  // namespace {{domain.domain | camelcase_to_hacker_style}}
 }  // namespace headless
 
-#endif  // HEADLESS_PUBLIC_DOMAINS_{{domain.domain | camelcase_to_hacker_style | upper}}_H_
+#endif  // HEADLESS_PUBLIC_DEVTOOLS_DOMAINS_{{domain.domain | camelcase_to_hacker_style | upper}}_H_