[Eche SWA] Adding Flags for resizing the Eche window.

- The feature flag: EcheSWAResizing to enable a naive resize for the Eche window.

      AboutFlagsTest.EveryFlagHasMetadata,
      browser_tests  --gtest_filter=All/EcheApp*

Bug: b/185943934
Test: Pass AboutFlagsHistogramTest.CheckHistograms,
Change-Id: Ia1fd9e86bab901df16d8300cce34928e56bdf0ae
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2843208
Reviewed-by: Giovanni Ortuño Urquidi <ortuno@chromium.org>
Reviewed-by: Daniel Nishi <dhnishi@chromium.org>
Commit-Queue: Paulz Chen <paulzchen@google.com>
Cr-Commit-Position: refs/heads/master@{#875402}
GitOrigin-RevId: 7ee2f68ebb4f13fbd65fe77972777eb4b0fa3698
diff --git a/metrics/histograms/enums.xml b/metrics/histograms/enums.xml
index 60cbbb1..11786f1 100644
--- a/metrics/histograms/enums.xml
+++ b/metrics/histograms/enums.xml
@@ -47950,6 +47950,7 @@
   <int value="1285905715" label="WebXRHitTest:enabled"/>
   <int value="1287625114" label="EnableIncognitoShortcutOnDesktop:disabled"/>
   <int value="1288612648" label="PluginVmFullscreen:enabled"/>
+  <int value="1288713607" label="EcheSWAResizing:disabled"/>
   <int value="1289433604" label="RecoverFromNeverSaveAndroid:enabled"/>
   <int value="1289495171" label="AssistantBetterOnboarding:disabled"/>
   <int value="1291257442" label="TabsInCBD:disabled"/>
@@ -48166,6 +48167,7 @@
   <int value="1467583815" label="AVIF:disabled"/>
   <int value="1469407485" label="disable-accelerated-2d-canvas"/>
   <int value="1472938299" label="WellKnownChangePassword:disabled"/>
+  <int value="1473157145" label="EcheSWAResizing:enabled"/>
   <int value="1473838479" label="EnableVirtualKeyboardMdUi:disabled"/>
   <int value="1473967338" label="OmniboxShortBookmarkSuggestions:enabled"/>
   <int value="1474861626" label="disable-multi-mirroring"/>