[DevTools] Move v8-related instrumentation from agents to InspectorSession.

third_party/WebKit/Source/platform/blink_platform.gypi

 {
   'includes': [
     'platform_generated.gypi',
   ],
   'variables': {
     'platform_files': [
       'AsyncFileSystemCallbacks.h',
       'CalculationValue.h',
       'CheckedInt.h',
       'ContentDecryptionModuleResult.h',
@@ skipping 1075 matching lines @@
       'v8_inspector/V8StringUtil.cpp',
       'v8_inspector/V8StringUtil.h',
       'v8_inspector/public/V8EventListenerInfo.h',
       'v8_inspector/public/V8ContentSearchUtil.h',
       'v8_inspector/public/V8ContextInfo.h',
       'v8_inspector/public/V8Debugger.h',
       'v8_inspector/public/V8DebuggerAgent.h',
       'v8_inspector/public/V8DebuggerClient.h',
       'v8_inspector/public/V8HeapProfilerAgent.h',
       'v8_inspector/public/V8InspectorSession.h',
+      'v8_inspector/public/V8InspectorSessionClient.h',
       'v8_inspector/public/V8ProfilerAgent.h',
       'v8_inspector/public/V8RuntimeAgent.h',
       'v8_inspector/public/V8StackTrace.h',
       'v8_inspector/public/V8ToProtocolValue.h',
       'web_memory_allocator_dump_impl.cc',
       'web_memory_allocator_dump_impl.h',
       'web_memory_dump_provider_adapter.cc',
       'web_memory_dump_provider_adapter.h',
       'web_process_memory_dump_impl.cc',
       'web_process_memory_dump_impl.h',
@@ skipping 203 matching lines @@
       ['OS!="mac"',
         {
           'platform_test_files': [
             'scroll/ScrollAnimatorTest.cpp',
           ],
         }
       ],
     ],
   },
 }