[DevTools] Various tweaks to inspector_protocol.

third_party/WebKit/Source/platform/inspector_protocol/sample_config.json

 {
     "protocol": {
         "path": "./relative/path/protocol/sample_protocol.json",
         "package": "include/generated/files/like/this",
         "output": "place/generated/files/here",
-        "namespace": ["sample_project", "protocol"]
+        "namespace": ["sample_project", "protocol"],
+        "export_macro": "LIB_EXPORT",
+        "export_header": "lib/lib_export.h"
     },
 
     "exported": {
         "package": "include/exported/files/like/this",
         "output": "place/exported/files/here",
         "string_header": "include/exported/string.h",
         "string_in": "String",
         "string_out": "String",
-        "to_string_out": "toString(%s)"
+        "to_string_out": "toString(%s)",
+        "export_macro": "LIB_EXPORT",
+        "export_header": "lib/lib_export.h"
     },
 
     "imported": {
         "path": "../relative/path/imported_protocol.json",
-        "package": "include/imported/files/like/this",
+        "package": "either/include/imported/files/from/here",
+        "header": "or/include/them/all/together/like/this/imported_protocol.h",
         "to_imported_string": "toImportedString(%s)",
         "from_imported_string": "fromImportedString(%s)",
         "namespace": ["imported_project", "protocol"]
     },
 
     "lib": {
         "package": "include/lib/files/like/this",
         "output": "place/generated/lib/files/here",
         "string_header": "string/implementation.h",
-        "platform_header": "platform/implementation.h"
-    },
-
-    "class_export": {
-        "macro": "LIB_EXPORT",
-        "header": "lib/lib_export.h"
+        "platform_header": "platform/implementation.h",
+        "export_macro": "LIB_EXPORT",
+        "export_header": "lib/lib_export.h"
     }
 }