Move browser crash key code to cross-platform area

Bug: None
Change-Id: Icaaa7fdc44ad65d0569e2cb412b3671ef70756ab
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2047405Reviewed-by: Dominic Mazzoni <dmazzoni@chromium.org>
Commit-Queue: Aaron Leventhal <aleventhal@chromium.org>
Cr-Commit-Position: refs/heads/master@{#741623}

content/browser/accessibility/browser_accessibility_state_impl.cc

@@ -8,6 +8,7 @@
 
 #include "base/bind.h"
 #include "base/command_line.h"
+#include "base/debug/crash_logging.h"
 #include "base/metrics/histogram_functions.h"
 #include "base/metrics/histogram_macros.h"
 #include "base/task/post_task.h"
@@ -231,6 +232,16 @@ void BrowserAccessibilityStateImpl::AddAccessibilityModeFlags(ui::AXMode mode) {
       WebContentsImpl::GetAllWebContents();
   for (size_t i = 0; i < web_contents_vector.size(); ++i)
     web_contents_vector[i]->AddAccessibilityMode(accessibility_mode_);
+
+  // Add a crash key with the ax_mode, to enable searching for top crashes that
+  // occur when accessibility is turned on. This adds it for the browser
+  // process, and elsewhere the same key is added to renderer processes.
+  static auto* ax_mode_crash_key = base::debug::AllocateCrashKeyString(
+      "ax_mode", base::debug::CrashKeySize::Size64);
+  if (ax_mode_crash_key) {
+    base::debug::SetCrashKeyString(ax_mode_crash_key,
+                                   accessibility_mode_.ToString());
+  }
 }
 
 void BrowserAccessibilityStateImpl::RemoveAccessibilityModeFlags(

ui/accessibility/platform/ax_platform_node.cc

@@ -86,6 +86,7 @@ void AXPlatformNode::RemoveAXModeObserver(AXModeObserver* observer) {
 
 // static
 void AXPlatformNode::NotifyAddAXModeFlags(AXMode mode_flags) {
+  // Note: this is only called on Windows.
   AXMode new_ax_mode(ax_mode_);
   new_ax_mode |= mode_flags;
 
@@ -95,14 +96,6 @@ void AXPlatformNode::NotifyAddAXModeFlags(AXMode mode_flags) {
   ax_mode_ = new_ax_mode;
   for (auto& observer : ax_mode_observers_.Get())
     observer.OnAXModeAdded(mode_flags);
-
-  // Add a crash key with the ax_mode, to enable searching for top crashes that
-  // occur when accessibility is turned on. This adds it for the browser
-  // process, and elsewhere the same key is added to renderer processes.
-  static auto* ax_mode_crash_key = base::debug::AllocateCrashKeyString(
-      "ax_mode", base::debug::CrashKeySize::Size64);
-  if (ax_mode_crash_key)
-    base::debug::SetCrashKeyString(ax_mode_crash_key, new_ax_mode.ToString());
 }
 
 // static