IVGCVSW-5636 'Implement NNAPI caching functions'

* Get number of inputs and outputs from optimized network.
* Get number of cached files if backend supports caching.

Signed-off-by: Sadik Armagan <sadik.armagan@arm.com>
Change-Id: Ie02ac123bb7df9b0593a2fe46b5bb564a5994780
diff --git a/src/backends/cl/ClBackendModelContext.cpp b/src/backends/cl/ClBackendModelContext.cpp
index b685bc2..75a2e05 100644
--- a/src/backends/cl/ClBackendModelContext.cpp
+++ b/src/backends/cl/ClBackendModelContext.cpp
@@ -32,7 +32,7 @@
 {
 
 ClBackendModelContext::ClBackendModelContext(const ModelOptions& modelOptions)
-    : m_CachedNetworkFilePath(""), m_IsFastMathEnabled(false), m_SaveCachedNetwork(false)
+    : m_CachedNetworkFilePath(""), m_IsFastMathEnabled(false), m_SaveCachedNetwork(false), m_CachedFileDescriptor(-1)
 {
    if (!modelOptions.empty())
    {
@@ -50,6 +50,10 @@
            {
                m_CachedNetworkFilePath = ParseFile(value, "");
            }
+           if (name == "CachedFileDescriptor")
+           {
+               m_CachedFileDescriptor = armnn::ParseIntBackendOption(value, -1);
+           }
        });
    }
 }
@@ -69,4 +73,9 @@
     return m_SaveCachedNetwork;
 }
 
+int ClBackendModelContext::GetCachedFileDescriptor() const
+{
+    return m_CachedFileDescriptor;
+}
+
 } // namespace armnn
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