processor: Move json, fuchsia, systrace parsers to importers subdirs

Proto parsers will move later.

Bug: 141459049
Change-Id: Iad4d7ca549902bec7c32b39d9e9ffe325625ba9d
diff --git a/BUILD b/BUILD
index 41f87b0..7d76c2c 100644
--- a/BUILD
+++ b/BUILD
@@ -646,14 +646,6 @@
         "src/trace_processor/ftrace_descriptors.h",
         "src/trace_processor/ftrace_utils.cc",
         "src/trace_processor/ftrace_utils.h",
-        "src/trace_processor/fuchsia_provider_view.cc",
-        "src/trace_processor/fuchsia_provider_view.h",
-        "src/trace_processor/fuchsia_trace_parser.cc",
-        "src/trace_processor/fuchsia_trace_parser.h",
-        "src/trace_processor/fuchsia_trace_tokenizer.cc",
-        "src/trace_processor/fuchsia_trace_tokenizer.h",
-        "src/trace_processor/fuchsia_trace_utils.cc",
-        "src/trace_processor/fuchsia_trace_utils.h",
         "src/trace_processor/graphics_event_parser.cc",
         "src/trace_processor/graphics_event_parser.h",
         "src/trace_processor/gzip_trace_parser.cc",
@@ -664,17 +656,29 @@
         "src/trace_processor/heap_profile_allocation_table.h",
         "src/trace_processor/heap_profile_tracker.cc",
         "src/trace_processor/heap_profile_tracker.h",
+        "src/trace_processor/importers/fuchsia/fuchsia_provider_view.cc",
+        "src/trace_processor/importers/fuchsia/fuchsia_provider_view.h",
+        "src/trace_processor/importers/fuchsia/fuchsia_trace_parser.cc",
+        "src/trace_processor/importers/fuchsia/fuchsia_trace_parser.h",
+        "src/trace_processor/importers/fuchsia/fuchsia_trace_tokenizer.cc",
+        "src/trace_processor/importers/fuchsia/fuchsia_trace_tokenizer.h",
+        "src/trace_processor/importers/fuchsia/fuchsia_trace_utils.cc",
+        "src/trace_processor/importers/fuchsia/fuchsia_trace_utils.h",
+        "src/trace_processor/importers/json/json_trace_parser.cc",
+        "src/trace_processor/importers/json/json_trace_parser.h",
+        "src/trace_processor/importers/json/json_trace_tokenizer.cc",
+        "src/trace_processor/importers/json/json_trace_tokenizer.h",
+        "src/trace_processor/importers/json/json_trace_utils.cc",
+        "src/trace_processor/importers/json/json_trace_utils.h",
         "src/trace_processor/importers/proto/ftrace_module.h",
         "src/trace_processor/importers/proto/proto_importer_module.h",
         "src/trace_processor/importers/proto/track_event_module.h",
+        "src/trace_processor/importers/systrace/systrace_parser.cc",
+        "src/trace_processor/importers/systrace/systrace_parser.h",
+        "src/trace_processor/importers/systrace/systrace_trace_parser.cc",
+        "src/trace_processor/importers/systrace/systrace_trace_parser.h",
         "src/trace_processor/instants_table.cc",
         "src/trace_processor/instants_table.h",
-        "src/trace_processor/json_trace_parser.cc",
-        "src/trace_processor/json_trace_parser.h",
-        "src/trace_processor/json_trace_tokenizer.cc",
-        "src/trace_processor/json_trace_tokenizer.h",
-        "src/trace_processor/json_trace_utils.cc",
-        "src/trace_processor/json_trace_utils.h",
         "src/trace_processor/metadata.h",
         "src/trace_processor/metadata_table.cc",
         "src/trace_processor/metadata_table.h",
@@ -725,10 +729,6 @@
         "src/trace_processor/syscalls_aarch64.h",
         "src/trace_processor/syscalls_armeabi.h",
         "src/trace_processor/syscalls_x86_64.h",
-        "src/trace_processor/systrace_parser.cc",
-        "src/trace_processor/systrace_parser.h",
-        "src/trace_processor/systrace_trace_parser.cc",
-        "src/trace_processor/systrace_trace_parser.h",
         "src/trace_processor/thread_table.cc",
         "src/trace_processor/thread_table.h",
         "src/trace_processor/timestamped_trace_piece.h",