Add flag for zip archiver on files app.

This CL just adds a flags for zip archiver, a new chrome extension for
files app.

BUG=706851

Review-Url: https://codereview.chromium.org/2799233002
Cr-Commit-Position: refs/heads/master@{#462761}

chrome/browser/about_flags.cc

@@ -2601,6 +2601,15 @@ const FeatureEntry kFeatureEntries[] = {
      SINGLE_VALUE_TYPE(ash::switches::kAshEnableSmoothScreenRotation)},
 #endif  // defined(USE_ASH)
 
+#if defined(OS_CHROMEOS)
+    {"enable-zip-archiver-on-file-manager",
+     flag_descriptions::kEnableZipArchiverOnFileManagerName,
+     flag_descriptions::kEnableZipArchiverOnFileManagerDescription,
+     kOsCrOS,
+     SINGLE_VALUE_TYPE(
+         chromeos::switches::kEnableZipArchiverOnFileManager)},
+#endif  // OS_CHROMEOS
+
     // NOTE: Adding new command-line switches requires adding corresponding
     // entries to enum "LoginCustomFlags" in histograms.xml. See note in
     // histograms.xml and don't forget to run AboutFlagsHistogramTest unit test.

chrome/browser/flag_descriptions.cc

@@ -2279,6 +2279,12 @@ const char kEnableTouchSupportForScreenMagnifierName[] =
 const char kEnableTouchSupportForScreenMagnifierDescription[] =
     "Enables touch support for screen magnifier";
 
+const char kEnableZipArchiverOnFileManagerName[] =
+    "ZIP archiver for Drive";
+
+const char kEnableZipArchiverOnFileManagerDescription[] =
+    "Enable the ability to archive and unpack files on Drive in the Files app";
+
 #endif  // defined(OS_CHROMEOS)
 
 #if defined(OS_ANDROID)

chrome/browser/flag_descriptions.h

@@ -2478,6 +2478,12 @@ extern const char kEnableTouchSupportForScreenMagnifierName[];
 // Description of the touch support for screen magnifier flag.
 extern const char kEnableTouchSupportForScreenMagnifierDescription[];
 
+// Name of zip archiver on files app flag.
+extern const char kEnableZipArchiverOnFileManagerName[];
+
+// Description of zip archiver on files app flag.
+extern const char kEnableZipArchiverOnFileManagerDescription[];
+
 #endif  // defined(OS_CHROMEOS)
 
 #if defined(OS_ANDROID)

chromeos/chromeos_switches.cc

@@ -304,6 +304,10 @@ const char kEnableVideoPlayerChromecastSupport[] =
 // Enables the VoiceInteraction support.
 const char kEnableVoiceInteraction[] = "enable-voice-interaction";
 
+// Enables zip archiver.
+const char kEnableZipArchiverOnFileManager[] =
+    "enable-zip-archiver-on-file-manager";
+
 // Disables ARC for managed accounts.
 const char kEnterpriseDisableArc[] = "enterprise-disable-arc";
 

chromeos/chromeos_switches.h

@@ -97,6 +97,7 @@ CHROMEOS_EXPORT extern const char kEnableTouchpadThreeFingerClick[];
 CHROMEOS_EXPORT extern const char kEnableTouchSupportForScreenMagnifier[];
 CHROMEOS_EXPORT extern const char kEnableVideoPlayerChromecastSupport[];
 CHROMEOS_EXPORT extern const char kEnableVoiceInteraction[];
+CHROMEOS_EXPORT extern const char kEnableZipArchiverOnFileManager[];
 CHROMEOS_EXPORT extern const char kEnterpriseDisableArc[];
 CHROMEOS_EXPORT extern const char kEnterpriseEnableForcedReEnrollment[];
 CHROMEOS_EXPORT extern const char kEnterpriseEnableZeroTouchEnrollment[];

tools/metrics/histograms/histograms.xml

@@ -101347,6 +101347,7 @@ from previous Chrome versions.
   <int value="683410401"
       label="enable-proximity-auth-bluetooth-low-energy-discovery"/>
   <int value="684806628" label="TranslateLanguageByULP:disabled"/>
+  <int value="685916283" label="enable-zip-archiver-on-file-manager"/>
   <int value="689489984" label="disable-zero-suggest"/>
   <int value="690185633" label="NonValidatingReloadOnNormalReload:disabled"/>
   <int value="691020108" label="NTPCondensedTileLayout:disabled"/>