Experimental flag for HiDPI-aware PDF Viewer

chrome/app/generated_resources.grd

Index: chrome/app/generated_resources.grd
diff --git a/chrome/app/generated_resources.grd b/chrome/app/generated_resources.grd
index a61a04bd9b163537b0d053b7a6f94757b98a5403..3358a9c9263d45bf51d6f1906059c19d4cd23df2 100644
--- a/chrome/app/generated_resources.grd
+++ b/chrome/app/generated_resources.grd
@@ -5345,6 +5345,12 @@ Keep your key file in a safe place. You will need it to create new versions of y
       <message name="IDS_FLAGS_FORCE_HIGH_DPI_DESCRIPTION" desc="Description of the 'Force high DPI mode' lab.">
         Overrides the device display density to force the use of high DPI mode and assets.
       </message>
+      <message name="IDS_FLAGS_ENABLE_HIGH_DPI_PDF_PLUGIN_NAME" desc="Name of the 'Enable high DPI PDF Plugin' lab.">
+        Enable high DPI Chrome PDF Viewer
+      </message>
+      <message name="IDS_FLAGS_ENABLE_HIGH_DPI_PDF_PLUGIN_DESCRIPTION" desc="Description of the 'Enable high DPI PDF Plugin' lab.">
+        Enables high DPI mode for the Chrome PDF Viewer on high DPI displays.
+      </message>
       <message name="IDS_FLAGS_IGNORE_GPU_BLACKLIST_NAME" desc="Name of the 'Ignore GPU blacklist' lab.">
         Override software rendering list
       </message>