content: Add finch feature flag for compositor image animations.

Add a finch flag for enabling image animations in the compositor. Its
currently disabled by default.

R=piman@chromium.org

Bug: 735662
Change-Id: I171d05b9411e3b3fa72b4df1be612deb0bd289b2
Reviewed-on: https://chromium-review.googlesource.com/703507Reviewed-by: Antoine Labour <piman@chromium.org>
Commit-Queue: Khushal <khushalsagar@chromium.org>
Cr-Commit-Position: refs/heads/master@{#506917}

content/browser/gpu/compositor_util.cc

@@ -304,6 +304,17 @@ bool IsGpuAsyncWorkerContextEnabled() {
   return true;
 }
 
+bool IsCompositorImageAnimationEnabled() {
+  if (base::CommandLine::ForCurrentProcess()->HasSwitch(
+          switches::kEnableCompositorImageAnimations))
+    return true;
+
+  if (base::FeatureList::IsEnabled(features::kCompositorImageAnimation))
+    return true;
+
+  return false;
+}
+
 std::unique_ptr<base::DictionaryValue> GetFeatureStatus() {
   GpuDataManagerImpl* manager = GpuDataManagerImpl::GetInstance();
   std::string gpu_access_blocked_reason;

content/browser/gpu/compositor_util.h

@@ -48,6 +48,9 @@ CONTENT_EXPORT bool IsCheckerImagingEnabled();
 // Returns true if worker context runs asynchronously in the gpu process.
 CONTENT_EXPORT bool IsGpuAsyncWorkerContextEnabled();
 
+// Returns true if image animations should run in the compositor.
+CONTENT_EXPORT bool IsCompositorImageAnimationEnabled();
+
 CONTENT_EXPORT std::unique_ptr<base::DictionaryValue> GetFeatureStatus();
 CONTENT_EXPORT std::unique_ptr<base::ListValue> GetProblems();
 CONTENT_EXPORT std::vector<std::string> GetDriverBugWorkarounds();

content/browser/renderer_host/render_process_host_impl.cc

@@ -2414,6 +2414,9 @@ static void AppendCompositorCommandLineFlags(base::CommandLine* command_line) {
   if (IsCheckerImagingEnabled())
     command_line->AppendSwitch(cc::switches::kEnableCheckerImaging);
 
+  if (IsCompositorImageAnimationEnabled())
+    command_line->AppendSwitch(switches::kEnableCompositorImageAnimations);
+
   if (IsGpuAsyncWorkerContextEnabled())
     command_line->AppendSwitch(switches::kEnableGpuAsyncWorkerContext);
 
@@ -2539,7 +2542,6 @@ void RenderProcessHostImpl::PropagateBrowserCommandLineToRenderer(
     switches::kDomAutomationController,
     switches::kEnableAutomation,
     switches::kEnableBrowserSideNavigation,
-    switches::kEnableCompositorImageAnimations,
     switches::kEnableDisplayList2dCanvas,
     switches::kEnableDistanceFieldText,
     switches::kEnableExperimentalCanvasFeatures,

content/public/common/content_features.cc

@@ -82,6 +82,9 @@ const base::Feature kCompositeOpaqueFixedPosition{
 const base::Feature kCompositeOpaqueScrollers{"CompositeOpaqueScrollers",
                                               base::FEATURE_ENABLED_BY_DEFAULT};
 
+const base::Feature kCompositorImageAnimation{
+    "CompositorImageAnimation", base::FEATURE_DISABLED_BY_DEFAULT};
+
 // Enables handling touch events in compositor using impl side touch action
 // knowledge.
 const base::Feature kCompositorTouchAction{"CompositorTouchAction",

content/public/common/content_features.h

@@ -30,6 +30,7 @@ CONTENT_EXPORT extern const base::Feature kCanvas2DImageChromium;
 CONTENT_EXPORT extern const base::Feature kCheckerImaging;
 CONTENT_EXPORT extern const base::Feature kCompositeOpaqueFixedPosition;
 CONTENT_EXPORT extern const base::Feature kCompositeOpaqueScrollers;
+CONTENT_EXPORT extern const base::Feature kCompositorImageAnimation;
 CONTENT_EXPORT extern const base::Feature kCompositorTouchAction;
 CONTENT_EXPORT extern const base::Feature kExpensiveBackgroundTimerThrottling;
 CONTENT_EXPORT extern const base::Feature kFeaturePolicy;