Send UMA about requested window state from tabs API

chrome/browser/extensions/api/tabs/tabs_api.cc

Index: chrome/browser/extensions/api/tabs/tabs_api.cc
diff --git a/chrome/browser/extensions/api/tabs/tabs_api.cc b/chrome/browser/extensions/api/tabs/tabs_api.cc
index 177698b372d8d6313c00750c28287e18915feb12..fb448f7971c488fbccf548c734d63c4e4d2e6cfe 100644
--- a/chrome/browser/extensions/api/tabs/tabs_api.cc
+++ b/chrome/browser/extensions/api/tabs/tabs_api.cc
@@ -17,6 +17,7 @@
 #include "base/logging.h"
 #include "base/memory/ptr_util.h"
 #include "base/memory/ref_counted_memory.h"
+#include "base/metrics/histogram_macros.h"
 #include "base/single_thread_task_runner.h"
 #include "base/stl_util.h"
 #include "base/strings/pattern.h"
@@ -199,6 +200,11 @@ void AssignOptionalValue(const std::unique_ptr<T>& source,
   }
 }
 
+void ReportRequestedWindowState(windows::WindowState state) {
+  UMA_HISTOGRAM_ENUMERATION("TabsApi.RequestedWindowState", state,
+                            windows::WINDOW_STATE_LAST + 1);
+}
+
 ui::WindowShowState ConvertToWindowShowState(windows::WindowState state) {
   switch (state) {
     case windows::WINDOW_STATE_NORMAL:
@@ -489,6 +495,10 @@ ExtensionFunction::ResponseAction WindowsCreateFunction::Run() {
   std::string extension_id;
 
   if (create_data) {
+    // Report UMA stats to decide when to remove the deprecated "docked" windows
+    // state (crbug.com/703733).
+    ReportRequestedWindowState(create_data->state);
+
     // Figure out window type before figuring out bounds so that default
     // bounds can be set according to the window type.
     switch (create_data->type) {
@@ -669,6 +679,10 @@ ExtensionFunction::ResponseAction WindowsUpdateFunction::Run() {
     return RespondNow(Error(error));
   }
 
+  // Report UMA stats to decide when to remove the deprecated "docked" windows
+  // state (crbug.com/703733).
+  ReportRequestedWindowState(params->update_info.state);
+
   ui::WindowShowState show_state =
       ConvertToWindowShowState(params->update_info.state);