[instrumentation] Generalize instrumentation to be used beyond the core layer

third_party/WebKit/Source/platform/BUILD.gn

 # Copyright 2014 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 import("//build/config/features.gni")
 import("//build/config/ui.gni")
 import("//testing/libfuzzer/fuzzer_test.gni")
 import("//testing/test.gni")
 import("//third_party/WebKit/public/public_features.gni")
 import("//third_party/WebKit/Source/build/scripts/scripts.gni")
@@ skipping 114 matching lines @@
   generator = "./" + rebase_path(
                   get_label_info(":character_data_generator($host_toolchain)",
                                  "root_out_dir") + "/character_data_generator",
                   root_build_dir)
   args = [
     generator,
     rebase_path(output_file, root_build_dir),
   ]
 }
 
+action("instrumentation_probes") {
+  script = "instrumentation/InstrumentingProbesCodeGenerator.py"
+
+  input_file = "instrumentation/PlatformInstrumentation.idl"
+  inputs = [
+    input_file,
+    "instrumentation/InstrumentingProbesImpl_cpp.template",
+    "instrumentation/InstrumentingProbesImpl_h.template",
+    "instrumentation/InstrumentingAgents_h.template",
+  ]
+
+  outputs = [
+    "$blink_platform_output_dir/PlatformInstrumentationAgents.h",
+    "$blink_platform_output_dir/PlatformInstrumentationInl.h",
+    "$blink_platform_output_dir/PlatformInstrumentationImpl.cpp",
+  ]
+
+  args = [
+    rebase_path(inputs[0], root_build_dir),
+    "--output_dir",
+    rebase_path(blink_platform_output_dir, root_build_dir),
+  ]
+}
+
 executable("character_data_generator") {
   sources = [
     "text/CharacterPropertyDataGenerator.cpp",
     "text/CharacterPropertyDataGenerator.h",
   ]
   configs += [ "//third_party/WebKit/Source:config" ]
   deps = [
     "//build/config/sanitizers:deps",
 
     # Default manifest on Windows (a no-op elsewhere).
     "//build/win:default_exe_manifest",
     "//third_party/icu",
   ]
 }
 
 # This isn't strictly necessary since we can just add the deps to "platform",
 # but it helps to have the targets match the GYP build.
 group("make_platform_generated") {
   visibility = []  # Allow re-assignment of list.
   visibility = [ "//third_party/WebKit/Source/*" ]
   public_deps = [
     ":character_data",
     ":color_data",
     ":font_family_names",
     ":http_names",
+    ":instrumentation_probes",
     ":runtime_enabled_features",
   ]
 }
 
 import("//build/config/pch.gni")
 
 config("blink_platform_pch") {
   if (enable_precompiled_headers) {
     if (is_win) {
       # This is a string rather than a file GN knows about. It has to match
@@ skipping 86 matching lines @@
     "MemoryCoordinator.cpp",
     "MemoryCoordinator.h",
     "PODArena.h",
     "PODFreeListArena.h",
     "PODInterval.h",
     "PODIntervalTree.h",
     "PODRedBlackTree.h",
     "PartitionAllocMemoryDumpProvider.cpp",
     "PartitionAllocMemoryDumpProvider.h",
     "PasteMode.h",
-    "PlatformInstrumentation.cpp",
-    "PlatformInstrumentation.h",
     "PlatformResourceLoader.cpp",
     "PlatformResourceLoader.h",
     "PluginScriptForbiddenScope.cpp",
     "PluginScriptForbiddenScope.h",
     "PopupMenu.h",
     "Prerender.cpp",
     "Prerender.h",
     "PrerenderClient.h",
     "ScopedOrientationChangeIndicator.cpp",
     "ScopedOrientationChangeIndicator.h",
@@ skipping 766 matching lines @@
     "image-decoders/webp/WEBPImageDecoder.h",
     "image-encoders/ImageEncoderUtils.cpp",
     "image-encoders/ImageEncoderUtils.h",
     "image-encoders/JPEGImageEncoder.cpp",
     "image-encoders/JPEGImageEncoder.h",
     "image-encoders/PNGImageEncoder.cpp",
     "image-encoders/PNGImageEncoder.h",
     "image-encoders/RGBAtoRGB.h",
     "image-encoders/WEBPImageEncoder.cpp",
     "image-encoders/WEBPImageEncoder.h",
+    "instrumentation/PlatformInstrumentation.cpp",
+    "instrumentation/PlatformInstrumentation.h",
+    "instrumentation/PlatformTraceEventsAgent.cpp",
+    "instrumentation/PlatformTraceEventsAgent.h",
     "instrumentation/tracing/MemoryCacheDumpProvider.cpp",
     "instrumentation/tracing/MemoryCacheDumpProvider.h",
     "instrumentation/tracing/TraceEvent.h",
     "instrumentation/tracing/TracedValue.cpp",
     "instrumentation/tracing/TracedValue.h",
     "instrumentation/tracing/web_memory_allocator_dump.cc",
     "instrumentation/tracing/web_memory_allocator_dump.h",
     "instrumentation/tracing/web_process_memory_dump.cc",
     "instrumentation/tracing/web_process_memory_dump.h",
     "json/JSONParser.cpp",
@@ skipping 313 matching lines @@
 
   sources -= blink_platform_neon_files
   sources -= blink_platform_msa_files
   sources -= blink_platform_sse_files
 
   # Add in the generated files.
   sources += get_target_outputs(":character_data") +
              get_target_outputs(":color_data") +
              get_target_outputs(":font_family_names") +
              get_target_outputs(":http_names") +
+             get_target_outputs(":instrumentation_probes") +
              get_target_outputs(":runtime_enabled_features")
 
   configs += [
     # TODO(jschuh): crbug.com/167187 fix size_t to int truncations.
     "//build/config/compiler:no_size_t_to_int_warning",
     ":blink_platform_pch",
     "//third_party/WebKit/Source:config",
     "//third_party/WebKit/Source:non_test_config",
   ]
 
@@ skipping 690 matching lines @@
     "//third_party/WebKit/Source:config",
     "//third_party/WebKit/Source:inside_blink",
   ]
 
   deps = [
     ":test_support",
     "//testing/gmock",
     "//testing/gtest",
   ]
 }