[NTP] Add method to check if a custom background is set

Add a method to InstantService to check if a custom background
has been set. Clean up a few places that were checking the
pref directly.

Bug: 873699
Change-Id: I755c6d26cb5fc6cce1239fd796fbfc5e3fb45ce5
Reviewed-on: https://chromium-review.googlesource.com/c/1338091Reviewed-by: Ramya Nagarajan <ramyan@chromium.org>
Commit-Queue: Kyle Milka <kmilka@chromium.org>
Cr-Commit-Position: refs/heads/master@{#610955}

chrome/browser/search/instant_service.cc

@@ -620,8 +620,6 @@ void InstantService::BuildThemeInfo() {
   }
 }
 
-// TODO(crbug.com/863942): Should switching default search provider retain the
-// copy of user uploaded photos?
 void InstantService::ApplyOrResetCustomBackgroundThemeInfo() {
   // Reset the pref if the feature is disabled.
   if (!features::IsCustomBackgroundsEnabled()) {
@@ -636,19 +634,8 @@ void InstantService::ApplyOrResetCustomBackgroundThemeInfo() {
   }
 
   // Attempt to get custom background URL from preferences.
-  const base::DictionaryValue* background_info =
-      pref_service_->GetDictionary(prefs::kNtpCustomBackgroundDict);
-  const base::Value* background_url =
-      background_info->FindKey(kNtpCustomBackgroundURL);
-  if (!background_url) {
-    ResetCustomBackgroundThemeInfo();
-    return;
-  }
-
-  // Verify that the custom background URL is valid.
-  GURL custom_background_url(
-      background_info->FindKey(kNtpCustomBackgroundURL)->GetString());
-  if (!custom_background_url.is_valid()) {
+  GURL custom_background_url;
+  if (!IsCustomBackgroundPrefValid(custom_background_url)) {
     ResetCustomBackgroundThemeInfo();
     return;
   }
@@ -745,6 +732,34 @@ void InstantService::FallbackToDefaultThemeInfo() {
   theme_info_->custom_background_attribution_action_url = GURL();
 }
 
+bool InstantService::IsCustomBackgroundSet() {
+  GURL custom_background_url;
+  if (!IsCustomBackgroundPrefValid(custom_background_url))
+    return false;
+
+  if (IsLocalFileUrl(custom_background_url) &&
+      !pref_service_->GetBoolean(prefs::kNtpCustomBackgroundLocalToDevice)) {
+    return false;
+  }
+
+  return true;
+}
+
+bool InstantService::IsCustomBackgroundPrefValid(GURL& custom_background_url) {
+  const base::DictionaryValue* background_info =
+      profile_->GetPrefs()->GetDictionary(prefs::kNtpCustomBackgroundDict);
+  if (!background_info)
+    return false;
+
+  const base::Value* background_url =
+      background_info->FindKey(kNtpCustomBackgroundURL);
+  if (!background_url)
+    return false;
+
+  custom_background_url = GURL(background_url->GetString());
+  return custom_background_url.is_valid();
+}
+
 void InstantService::RemoveLocalBackgroundImageCopy() {
   base::FilePath path = profile_->GetPath().AppendASCII(
       chrome::kChromeSearchLocalNtpBackgroundFilename);

chrome/browser/search/instant_service.h

@@ -132,6 +132,9 @@ class InstantService : public KeyedService,
 
   void AddValidBackdropUrlForTesting(const GURL& url) const;
 
+  // Check if a custom background has been set by the user.
+  bool IsCustomBackgroundSet();
+
  private:
   class SearchProviderObserver;
 
@@ -178,6 +181,10 @@ class InstantService : public KeyedService,
 
   void RemoveLocalBackgroundImageCopy();
 
+  // Returns false if the custom background pref cannot be parsed, otherwise
+  // returns true and sets custom_background_url to the value in the pref.
+  bool IsCustomBackgroundPrefValid(GURL& custom_background_url);
+
   // Update the background pref to point to
   // chrome-search://local-ntp/background.jpg
   void SetBackgroundToLocalResource();

chrome/browser/ui/search/ntp_user_data_logger.cc

@@ -10,6 +10,8 @@
 #include "base/metrics/histogram_macros.h"
 #include "base/metrics/user_metrics.h"
 #include "chrome/browser/after_startup_task_utils.h"
+#include "chrome/browser/search/instant_service.h"
+#include "chrome/browser/search/instant_service_factory.h"
 #include "chrome/browser/search/ntp_features.h"
 #include "chrome/browser/search/search.h"
 #include "chrome/browser/themes/theme_service.h"
@@ -87,10 +89,6 @@ enum VoiceError {
   VOICE_ERROR_MAX
 };
 
-// Key used in prefs::kNtpCustomBackgroundDict to save a background image URL.
-// TODO(crbug.com/873699): Refactor customization check for better testability.
-const char kNtpCustomBackgroundURL[] = "background_url";
-
 // Logs BackgroundCustomization availability on the NTP,
 void LogBackgroundCustomizationAvailability(
     BackgroundCustomization availability) {
@@ -490,15 +488,9 @@ bool NTPUserDataLogger::ThemeIsConfigured() const {
 }
 
 bool NTPUserDataLogger::CustomBackgroundIsConfigured() const {
-  const base::DictionaryValue* background_info =
-      profile_->GetPrefs()->GetDictionary(prefs::kNtpCustomBackgroundDict);
-  const base::Value* background_url =
-      background_info->FindKey(kNtpCustomBackgroundURL);
-  if (!background_url) {
-    return false;
-  }
-  GURL custom_background_url(background_url->GetString());
-  return custom_background_url.is_valid();
+  InstantService* instant_service =
+      InstantServiceFactory::GetForProfile(profile_);
+  return instant_service->IsCustomBackgroundSet();
 }
 
 void NTPUserDataLogger::EmitNtpStatistics(base::TimeDelta load_time) {