[Impeller] Flip the viewport on vulkan (#36421)

Author: iskakaushik

impeller/renderer/backend/vulkan/context_vk.cc

@@ -272,7 +272,7 @@ ContextVK::ContextVK(
 
   vk::ApplicationInfo application_info;
   application_info.setApplicationVersion(VK_API_VERSION_1_0);
-  application_info.setApiVersion(VK_API_VERSION_1_0);
+  application_info.setApiVersion(VK_API_VERSION_1_1);
   application_info.setEngineVersion(VK_API_VERSION_1_0);
   application_info.setPEngineName("Impeller");
   application_info.setPApplicationName("Impeller");

impeller/renderer/backend/vulkan/render_pass_vk.cc

@@ -342,7 +342,8 @@ void RenderPassVK::SetViewportAndScissor(const Command& command) const {
       {.rect = Rect::MakeSize(GetRenderTargetSize())});
   vk::Viewport viewport = vk::Viewport()
                               .setWidth(vp.rect.size.width)
-                              .setHeight(vp.rect.size.height)
+                              .setHeight(-vp.rect.size.height)
+                              .setY(vp.rect.size.height)
                               .setMinDepth(0.0f)
                               .setMaxDepth(1.0f);
   command_buffer_->setViewport(0, 1, &viewport);