Snapshot of all changes to get jumbo in blink and content.

third_party/WebKit/Source/core/core.gni

Index: third_party/WebKit/Source/core/core.gni
diff --git a/third_party/WebKit/Source/core/core.gni b/third_party/WebKit/Source/core/core.gni
index 0749c98fb7d5871a381bf8eb6d0cbd2817314a3d..ad1aa7ad8a6255e61444bbf3b374fc0aaf6f9bb0 100644
--- a/third_party/WebKit/Source/core/core.gni
+++ b/third_party/WebKit/Source/core/core.gni
@@ -118,6 +118,14 @@ template("blink_core_sources") {
                            ])
   }
 }
+
+template("blink_unit_test_source_set") {
+  jumbo_target(target_name) {
+    target_type = "source_set"
+    forward_variables_from(invoker, "*")
+  }
+}
+
 set_defaults("blink_core_sources") {
   # This sets the default list of configs when the blink_core_sources target
   # is defined. The default_compiler_configs comes from BUILDCONFIG.gn and
@@ -128,3 +136,7 @@ set_defaults("blink_core_sources") {
   # support, for lower Windows build times.
   configs += [ "//third_party/WebKit/Source/core:blink_core_pch" ]
 }
+
+set_defaults("blink_unit_test_source_set") {
+  configs = default_compiler_configs
+}