Rename angle::Format::ID to angle::FormatID.

This allow for predeclaring the enum. It solves some include dependency
issues.

Bug: angleproject:2729
Change-Id: Ibbbab0796e466c62848404ba277c5f454fd9ac62
Reviewed-on: https://chromium-review.googlesource.com/1142299
Commit-Queue: Jamie Madill <jmadill@chromium.org>
Reviewed-by: Frank Henigman <fjhenigman@chromium.org>
Reviewed-by: Geoff Lang <geofflang@chromium.org>
diff --git a/src/libANGLE/renderer/vulkan/VertexArrayVk.cpp b/src/libANGLE/renderer/vulkan/VertexArrayVk.cpp
index cd9433c..596e869 100644
--- a/src/libANGLE/renderer/vulkan/VertexArrayVk.cpp
+++ b/src/libANGLE/renderer/vulkan/VertexArrayVk.cpp
@@ -282,7 +282,7 @@
         mCurrentArrayBufferOffsets[attribIndex]   = 0;
         mCurrentArrayBufferStrides[attribIndex]   = 0;
         mCurrentArrayBufferFormats[attribIndex] =
-            &renderer->getFormat(angle::Format::ID::R32G32B32A32_FLOAT);
+            &renderer->getFormat(angle::FormatID::R32G32B32A32_FLOAT);
     }
 }
 
@@ -610,7 +610,7 @@
         mCurrentArrayBufferResources[attribIndex] = nullptr;
         mCurrentArrayBufferStrides[attribIndex]   = 0;
         mCurrentArrayBufferFormats[attribIndex] =
-            &renderer->getFormat(angle::Format::ID::R32G32B32A32_FIXED);
+            &renderer->getFormat(angle::FormatID::R32G32B32A32_FIXED);
         mDirtyPackedInputs.set(attribIndex);
     }
 }