Implement OverlayPanels as SceneOverlays

chrome/browser/android/compositor/scene_layer/contextual_search_scene_layer.cc

Index: chrome/browser/android/compositor/scene_layer/contextual_search_scene_layer.cc
diff --git a/chrome/browser/android/compositor/scene_layer/contextual_search_scene_layer.cc b/chrome/browser/android/compositor/scene_layer/contextual_search_scene_layer.cc
index dbd76004ac26d2c3115430ac6e1125f5da5cba85..1e201d2dccb2bbd3ae8b06eb0f67b8922188f9c1 100644
--- a/chrome/browser/android/compositor/scene_layer/contextual_search_scene_layer.cc
+++ b/chrome/browser/android/compositor/scene_layer/contextual_search_scene_layer.cc
@@ -6,7 +6,9 @@
 
 #include "base/android/jni_android.h"
 #include "base/android/jni_array.h"
+#include "cc/layers/solid_color_layer.h"
 #include "chrome/browser/android/compositor/layer/contextual_search_layer.h"
+#include "content/public/browser/android/compositor.h"
 #include "content/public/browser/android/content_view_core.h"
 #include "jni/ContextualSearchSceneLayer_jni.h"
 #include "ui/android/resources/resource_manager_impl.h"
@@ -17,7 +19,27 @@ namespace android {
 
 ContextualSearchSceneLayer::ContextualSearchSceneLayer(JNIEnv* env,
                                                        jobject jobj)
-    : SceneLayer(env, jobj) {
+    : SceneLayer(env, jobj),
+      base_page_brightness_(1.0f),
+      content_container_(cc::Layer::Create()) {
+  // Responsible for moving the base page without modifying the layer itself.
+  content_container_->SetIsDrawable(true);
+  content_container_->SetPosition(gfx::PointF(0.0f, 0.0f));
+  layer()->AddChild(content_container_);
+}
+
+void ContextualSearchSceneLayer::CreateContextualSearchLayer(
+    JNIEnv* env,
+    const JavaParamRef<jobject>& object,
+    const JavaParamRef<jobject>& jresource_manager) {
+  ui::ResourceManager* resource_manager =
+      ui::ResourceManagerImpl::FromJavaObject(jresource_manager);
+  contextual_search_layer_ = ContextualSearchLayer::Create(resource_manager);
+
+  // The Contextual Search layer is initially invisible.
+  contextual_search_layer_->layer()->SetHideLayerAndSubtree(true);
+
+  layer()->AddChild(contextual_search_layer_->layer());
 }
 
 ContextualSearchSceneLayer::~ContextualSearchSceneLayer() {
@@ -41,6 +63,8 @@ void ContextualSearchSceneLayer::UpdateContextualSearchLayer(
     jint peek_promo_ripple_resource_id,
     jint peek_promo_text_resource_id,
     jfloat dp_to_px,
+    jfloat base_page_brightness,
+    jfloat base_page_offset,
     const JavaParamRef<jobject>& jcontent_view_core,
     jboolean search_promo_visible,
     jfloat search_promo_height,
@@ -72,19 +96,7 @@ void ContextualSearchSceneLayer::UpdateContextualSearchLayer(
     jboolean progress_bar_visible,
     jfloat progress_bar_height,
     jfloat progress_bar_opacity,
-    jint progress_bar_completion,
-    const JavaParamRef<jobject>& jresource_manager) {
-  ui::ResourceManager* resource_manager =
-      ui::ResourceManagerImpl::FromJavaObject(jresource_manager);
-  // Lazily construct the contextual search layer, as the feature is only
-  // conditionally enabled.
-  if (!contextual_search_layer_.get()) {
-    if (!resource_manager)
-      return;
-    contextual_search_layer_ = ContextualSearchLayer::Create(resource_manager);
-    layer_->AddChild(contextual_search_layer_->layer());
-  }
-
+    jint progress_bar_completion) {
   // NOTE(pedrosimonetti): The ContentViewCore might not exist at this time if
   // the Contextual Search Result has not been requested yet. In this case,
   // we'll pass NULL to Contextual Search's Layer Tree.
@@ -93,6 +105,20 @@ void ContextualSearchSceneLayer::UpdateContextualSearchLayer(
                           : content::ContentViewCore::GetNativeContentViewCore(
                                 env, jcontent_view_core);
 
+  // Fade the base page out.
+  if (base_page_brightness_ != base_page_brightness) {
+    base_page_brightness_ = base_page_brightness;
+    cc::FilterOperations filters;
+    if (base_page_brightness < 1.f) {
+      filters.Append(
+          cc::FilterOperation::CreateBrightnessFilter(base_page_brightness));
+    }
+    content_container_->SetFilters(filters);
+  }
+
+  // Move the base page contents up.
+  content_container_->SetPosition(gfx::PointF(0.0f, base_page_offset));
+
   contextual_search_layer_->SetProperties(
       search_bar_background_resource_id,
       search_context_resource_id,
@@ -141,6 +167,36 @@ void ContextualSearchSceneLayer::UpdateContextualSearchLayer(
       progress_bar_height,
       progress_bar_opacity,
       progress_bar_completion);
+
+  // Make the layer visible if it is not already.
+  contextual_search_layer_->layer()->SetHideLayerAndSubtree(false);
+}
+
+void ContextualSearchSceneLayer::SetContentTree(
+    JNIEnv* env,
+    const JavaParamRef<jobject>& jobj,
+    const JavaParamRef<jobject>& jcontent_tree) {
+  SceneLayer* content_tree = FromJavaObject(env, jcontent_tree);
+  if (!content_tree || !content_tree->layer()) return;
+
+  if (!content_tree->layer()->parent()
+      || (content_tree->layer()->parent()->id() != content_container_->id())) {
+    content_container_->AddChild(content_tree->layer());
+  }
+}
+
+void ContextualSearchSceneLayer::HideTree(JNIEnv* env,
+    const JavaParamRef<jobject>& jobj) {
+  // TODO(mdjones): Create super class for this logic.
+  if (contextual_search_layer_) {
+    contextual_search_layer_->layer()->SetHideLayerAndSubtree(true);
+  }
+  // Reset base page brightness.
+  cc::FilterOperations filters;
+  filters.Append(cc::FilterOperation::CreateBrightnessFilter(1.0f));
+  content_container_->SetFilters(filters);
+  // Reset base page offset.
+  content_container_->SetPosition(gfx::PointF(0.0f, 0.0f));
 }
 
 static jlong Init(JNIEnv* env, const JavaParamRef<jobject>& jobj) {