RemoteMacViews: Add about:flags entry for RemoteMacViews

The feature has been around for a while, but having it in about:flags
will help development along.

Bug: 859152
Change-Id: I3da5fff7b57961f3c41a628c69a9b65b69122860
Reviewed-on: https://chromium-review.googlesource.com/1226298
Commit-Queue: ccameron <ccameron@chromium.org>
Reviewed-by: Elly Fong-Jones <ellyjones@chromium.org>
Cr-Commit-Position: refs/heads/master@{#593797}

chrome/browser/about_flags.cc

@@ -2029,6 +2029,10 @@ const FeatureEntry kFeatureEntries[] = {
      flag_descriptions::kHostedAppsInWindowsDescription, kOsMac,
      ENABLE_DISABLE_VALUE_TYPE(switches::kEnableHostedAppsInWindows,
                                switches::kDisableHostedAppsInWindows)},
+    {"create-app-windows-in-app",
+     flag_descriptions::kCreateAppWindowsInAppShimProcessName,
+     flag_descriptions::kCreateAppWindowsInAppShimProcessDescription, kOsMac,
+     FEATURE_VALUE_TYPE(features::kHostWindowsInAppShimProcess)},
     {"disable-hosted-app-shim-creation",
      flag_descriptions::kHostedAppShimCreationName,
      flag_descriptions::kHostedAppShimCreationDescription, kOsMac,

chrome/browser/flag_descriptions.cc

@@ -2935,6 +2935,12 @@ const char kHostedAppsInWindowsDescription[] =
     "Allows hosted apps to be opened in windows instead of being limited to "
     "tabs.";
 
+const char kCreateAppWindowsInAppShimProcessName[] =
+    "Create native windows in the app process";
+const char kCreateAppWindowsInAppShimProcessDescription[] =
+    "Create native windows the app shim process, instead of of the browser "
+    "process.";
+
 const char kMacRTLName[] = "Enable RTL";
 const char kMacRTLDescription[] = "Mirrors the UI for RTL language users";
 

chrome/browser/flag_descriptions.h

@@ -1770,6 +1770,9 @@ extern const char kEnableWebAuthenticationTouchIdDescription[];
 extern const char kHostedAppsInWindowsName[];
 extern const char kHostedAppsInWindowsDescription[];
 
+extern const char kCreateAppWindowsInAppShimProcessName[];
+extern const char kCreateAppWindowsInAppShimProcessDescription[];
+
 extern const char kMacRTLName[];
 extern const char kMacRTLDescription[];
 

tools/metrics/histograms/enums.xml

@@ -30357,6 +30357,7 @@ from previous Chrome versions.
   <int value="1739456903" label="PWAFullCodeCache:enabled"/>
   <int value="1747279677" label="disable-delegated-renderer"/>
   <int value="1752168018" label="enable-stale-while-revalidate"/>
+  <int value="1755024316" label="HostWindowsInAppShimProcess:disabled"/>
   <int value="1760946944" label="MacViewsAutofillPopup:disabled"/>
   <int value="1762320532" label="AutofillKeyboardAccessory:enabled"/>
   <int value="1766676896" label="affiliation-based-matching:disabled"/>
@@ -30544,6 +30545,7 @@ from previous Chrome versions.
   <int value="2098907258" label="UseSurfaceLayerForVideo:disabled"/>
   <int value="2101151142" label="disable-direct-write"/>
   <int value="2104788328" label="use-winrt-midi-api"/>
+  <int value="2106855416" label="HostWindowsInAppShimProcess:enabled"/>
   <int value="2113804526" label="EnableAppShortcutSearch:enabled"/>
   <int value="2114843059" label="ContextualSuggestionsOptOut:enabled"/>
   <int value="2119964154" label="enable-download-resumption"/>

ui/base/ui_base_features.h

@@ -68,6 +68,8 @@ UI_BASE_EXPORT bool IsMultiProcessMash();
 UI_BASE_EXPORT bool IsSingleProcessMash();
 
 #if defined(OS_MACOSX)
+UI_BASE_EXPORT extern const base::Feature kHostWindowsInAppShimProcess;
+
 // Returns true if the NSWindows for apps will be created in the app's process,
 // and will forward input to the browser process.
 UI_BASE_EXPORT bool HostWindowsInAppShimProcess();