Add about:flag for feature PdfIsolation

Bug: 809614
Change-Id: I63fb89898c9ed83e532fd148a0a4dd318c194693
Reviewed-on: https://chromium-review.googlesource.com/956488
Commit-Queue: Tom Sepez <tsepez@chromium.org>
Reviewed-by: John Abd-El-Malek <jam@chromium.org>
Cr-Commit-Position: refs/heads/master@{#542215}

chrome/browser/about_flags.cc

@@ -3746,6 +3746,10 @@ const FeatureEntry kFeatureEntries[] = {
      flag_descriptions::kVizHitTestDrawQuadDescription, kOsAll,
      FEATURE_VALUE_TYPE(features::kEnableVizHitTestDrawQuad)},
 
+    {"pdf-isolation", flag_descriptions::kPdfIsolationName,
+     flag_descriptions::kPdfIsolationDescription, kOsDesktop,
+     FEATURE_VALUE_TYPE(features::kPdfIsolation)},
+
     // NOTE: Adding a new flag requires adding a corresponding entry to enum
     // "LoginCustomFlags" in tools/metrics/histograms/enums.xml. See "Flag
     // Histograms" in tools/metrics/histograms/README.md (run the

chrome/browser/flag_descriptions.cc

@@ -1164,6 +1164,10 @@ const char kPasswordSearchMobileName[] = "Password search";
 const char kPasswordSearchMobileDescription[] =
     "Search functionality in password settings.";
 
+const char kPdfIsolationName[] = "PDF Isolation";
+const char kPdfIsolationDescription[] =
+    "Render PDF files from different origins in different plugin processes.";
+
 const char kPermissionsBlacklistName[] = "Permissions Blacklist";
 const char kPermissionsBlacklistDescription[] =
     "Enables the Permissions Blacklist, which blocks permissions for "

chrome/browser/flag_descriptions.h

@@ -725,6 +725,9 @@ extern const char kPasswordImportDescription[];
 extern const char kPasswordSearchMobileName[];
 extern const char kPasswordSearchMobileDescription[];
 
+extern const char kPdfIsolationName[];
+extern const char kPdfIsolationDescription[];
+
 extern const char kPermissionsBlacklistName[];
 extern const char kPermissionsBlacklistDescription[];
 

tools/metrics/histograms/enums.xml

@@ -25991,6 +25991,7 @@ from previous Chrome versions.
   <int value="-1235586511" label="enable-datasaver-prompt"/>
   <int value="-1225198073" label="ReaderModeInCCT:disabled"/>
   <int value="-1224962996" label="PwaImprovedSplashScreen:disabled"/>
+  <int value="-1222805155" label="PdfIsolation:enabled"/>
   <int value="-1218608640" label="disable-offline-load-stale-cache"/>
   <int value="-1217425153" label="ChromeHomeClearUrlOnOpen:enabled"/>
   <int value="-1216837777" label="clear-data-reduction-proxy-data-savings"/>
@@ -26073,6 +26074,7 @@ from previous Chrome versions.
   <int value="-1039555838" label="GamepadExtensions:enabled"/>
   <int value="-1034344165" label="V8NoTurbo:disabled"/>
   <int value="-1033738911" label="enable-mac-views-dialogs"/>
+  <int value="-1031350684" label="PdfIsolation:disabled"/>
   <int value="-1029920490" label="IdleTimeSpellChecking:enabled"/>
   <int value="-1028733699" label="MacViewsWebUIDialogs:disabled"/>
   <int value="-1027254093" label="LockScreenNotifications:disabled"/>