Create per-platform pdfium test suppression files.

testing/SUPPRESSIONS

Index: testing/SUPPRESSIONS
diff --git a/testing/SUPPRESSIONS b/testing/SUPPRESSIONS
index 1d417b22636bd6b0608421fc5f216cb1ee71cb82..474248360e7d061bdd480367b4e38b3c4d754cbf 100644
--- a/testing/SUPPRESSIONS
+++ b/testing/SUPPRESSIONS
@@ -1,48 +1,2 @@
-# List of tests to be skipped, one per line.
+# List of tests to be skipped, on all platforms, one per line.
 # Try to keep the file alphabetized.
-1_10_watermark.pdf
-1_1_textbox.pdf
-1_2_typewriter.pdf
-1_3_callout.pdf
-2_6_textbox.pdf
-3_4_textbox.pdf
-5.2.pdf
-action.pdf
-all_trigger_alert.pdf
-all_trigger_browsefordoc.pdf
-all_trigger_mailmsg.pdf
-all_trigger_newdoc.pdf
-all_trigger_print.pdf
-bookmark.pdf
-calcorderindex_test.pdf
-calculate_order.pdf
-ch_1.pdf
-check_box.pdf
-combo_box.pdf
-fillform.pdf
-form_action_trigger.pdf
-format_custom_format.pdf
-format_custom_keystroke.pdf
-form_button_sign_url.pdf
-form_combobox0.pdf
-form_combobox_actioin_goto.pdf
-form_combobox_date1.pdf
-form_combobox_importform.pdf
-form_combobox_resetform.pdf
-form_combo_sign_url.pdf
-formfeild.pdf
-form_list1.pdf
-form_list.pdf
-form_text_sign_url.pdf
-javascriptaction.pdf
-js_calculate.pdf
-list_box.pdf
-number.pdf
-push_button.pdf
-radio_button.pdf
-run_custom_validate_script.pdf
-signature_4.pdf
-signature.pdf
-test_app_beep.pdf
-test_control.pdf
-text_field.pdf