[Depends on #8344] Implement ApiHandler functions and add JsonWriter (#8379)

* Introduce FrameGraphInfo class

* Move the assignment into pimpl

* Make ctors explicit

* Add ctors to fg info structs

* Revert the macro change to align with existing

* Address the comments

* Remove pimpl and move func def to .cc

* Fix

* Convert the FrameGraph to FrameGraphInfo

* Initialize and update debug server on engine side

* Fix compile error

* Address the comments

* Update

* Use camelCase

* Use camelCase

* Update

* Add JsonWriter to convert fginfo to json

* Add getStatus api and implement it

* Add increment

* Implement GET apis

* Fix compile error

* Update

* Use c_str_safe

* Add operator== for FrameGraphInfo

* Call updateFrameGraph in appropriate locations

* Address the comments

libs/fgviewer/src/FrameGraphInfo.cpp

@@ -1,5 +1,5 @@
 /*
-* Copyright (C) 2024 The Android Open Source Project
+ * Copyright (C) 2024 The Android Open Source Project
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -25,15 +25,33 @@ FrameGraphInfo::~FrameGraphInfo() = default;
 
 FrameGraphInfo::FrameGraphInfo(FrameGraphInfo&& rhs) noexcept = default;
 
+bool FrameGraphInfo::operator==(const FrameGraphInfo& rhs) const {
+    return viewName == rhs.viewName
+            && passes == rhs.passes
+            && resources == rhs.resources;
+}
+
 FrameGraphInfo::Pass::Pass(utils::CString name, std::vector<ResourceId> reads,
     std::vector<ResourceId> writes): name(std::move(name)),
                                     reads(std::move(reads)),
                                     writes(std::move(writes)) {}
 
+bool FrameGraphInfo::Pass::operator==(const Pass& rhs) const {
+    return name == rhs.name && reads == rhs.reads && writes == rhs.writes;
+}
+
 FrameGraphInfo::Resource::Resource(ResourceId id, utils::CString name,
     std::vector<Property> properties): id(id),
     name(std::move(name)), properties(std::move(properties)) {}
 
+bool FrameGraphInfo::Resource::operator==(const Resource& rhs) const {
+    return id == rhs.id && name == rhs.name && properties == rhs.properties;
+}
+
+bool FrameGraphInfo::Resource::Property::operator==(const Property &rhs) const {
+    return name == rhs.name && value == rhs.value;
+}
+
 void FrameGraphInfo::setResources(
     std::unordered_map<ResourceId, Resource> resources) {
     this->resources = std::move(resources);
@@ -43,4 +61,17 @@ void FrameGraphInfo::setPasses(std::vector<Pass> sortedPasses) {
     passes = std::move(sortedPasses);
 }
 
+const char* FrameGraphInfo::getViewName() const {
+    return viewName.c_str_safe();
+}
+
+const std::vector<FrameGraphInfo::Pass>& FrameGraphInfo::getPasses() const {
+    return passes;
+}
+
+const std::unordered_map<ResourceId, FrameGraphInfo::Resource>&
+    FrameGraphInfo::getResources() const {
+    return resources;
+}
+
 } // namespace filament::fgviewer