Experimental flag for HiDPI-aware PDF Viewer

chrome/renderer/pepper/ppb_pdf_impl.cc

Index: chrome/renderer/pepper/ppb_pdf_impl.cc
diff --git a/chrome/renderer/pepper/ppb_pdf_impl.cc b/chrome/renderer/pepper/ppb_pdf_impl.cc
index 388c4dd8d65d224640d56953bdc58c7c4cbd7765..cfbacb427b9c68ef0c63404d73b0f4a1a7ad2be8 100644
--- a/chrome/renderer/pepper/ppb_pdf_impl.cc
+++ b/chrome/renderer/pepper/ppb_pdf_impl.cc
@@ -4,9 +4,11 @@
 
 #include "chrome/renderer/pepper/ppb_pdf_impl.h"
 
+#include "base/command_line.h"
 #include "base/metrics/histogram.h"
 #include "base/utf_string_conversions.h"
 #include "build/build_config.h"
+#include "chrome/common/chrome_switches.h"
 #include "chrome/common/render_messages.h"
 #include "chrome/renderer/print_web_view_helper.h"
 #include "content/public/common/child_process_sandbox_support_linux.h"
@@ -347,6 +349,18 @@ void SaveAs(PP_Instance instance_id) {
   instance->delegate()->SaveURLAs(instance->plugin_url());
 }
 
+PP_Bool IsFeatureEnabled(PP_PDFFeature feature) {
+  PP_Bool result = PP_FALSE;
+  switch (feature) {
+    case PP_PDFFEATURE_HIDPI:
+      if (CommandLine::ForCurrentProcess()->HasSwitch(
+          switches::kEnableHighDPIPDFPlugin))
+        result = PP_TRUE;
+      break;
+  }
+  return result;
+}
+
 const PPB_PDF ppb_pdf = {
   &GetLocalizedString,
   &GetResourceImage,
@@ -360,7 +374,8 @@ const PPB_PDF ppb_pdf = {
   &UserMetricsRecordAction,
   &HasUnsupportedFeature,
   &SaveAs,
-  &PPB_PDF_Impl::InvokePrintingForInstance
+  &PPB_PDF_Impl::InvokePrintingForInstance,
+  &IsFeatureEnabled
 };
 
 }  // namespace